Merge commit '50d3e596bbe89c95615f96eb71f6bc5be737a1db' into Basilisk-releasev2018.07.18

# Conflicts:
#	browser/app/profile/firefox.js
#	browser/components/preferences/jar.mn

12 files changed, 0 insertions, 3398 deletions

diff --git a/browser/components/feeds/BrowserFeeds.manifest b/browser/components/feeds/BrowserFeeds.manifest
deleted file mode 100644
index ac5c299fa..000000000
--- a/browser/components/feeds/BrowserFeeds.manifest
+++ /dev/null
@@ -1,25 +0,0 @@
-# This component must restrict its registration for the app-startup category
-# to the specific list of apps that use it so it doesn't get loaded in xpcshell.
-# Thus we restrict it to these apps:
-#
-#   b2g:            {3c2e2abc-06d4-11e1-ac3b-374f68613e61}
-#   browser:        {ec8030f7-c20a-464f-9b0e-13a3a9e97384}
-#   mobile/android: {aa3c5121-dab2-40e2-81ca-7ea25febc110}
-#   mobile/xul:     {a23983c0-fd0e-11dc-95ff-0800200c9a66}
-#   graphene:       {d1bfe7d9-c01e-4237-998b-7b5f960a4314}
-
-component {229fa115-9412-4d32-baf3-2fc407f76fb1} FeedConverter.js
-contract @mozilla.org/streamconv;1?from=application/vnd.mozilla.maybe.feed&to=*/* {229fa115-9412-4d32-baf3-2fc407f76fb1}
-contract @mozilla.org/streamconv;1?from=application/vnd.mozilla.maybe.video.feed&to=*/* {229fa115-9412-4d32-baf3-2fc407f76fb1}
-contract @mozilla.org/streamconv;1?from=application/vnd.mozilla.maybe.audio.feed&to=*/* {229fa115-9412-4d32-baf3-2fc407f76fb1}
-component {2376201c-bbc6-472f-9b62-7548040a61c6} FeedConverter.js
-contract @mozilla.org/browser/feeds/result-service;1 {2376201c-bbc6-472f-9b62-7548040a61c6}
-component {4f91ef2e-57ba-472e-ab7a-b4999e42d6c0} FeedConverter.js
-contract @mozilla.org/network/protocol;1?name=feed {4f91ef2e-57ba-472e-ab7a-b4999e42d6c0}
-component {1c31ed79-accd-4b94-b517-06e0c81999d5} FeedConverter.js
-contract @mozilla.org/network/protocol;1?name=pcast {1c31ed79-accd-4b94-b517-06e0c81999d5}
-component {49bb6593-3aff-4eb3-a068-2712c28bd58e} FeedWriter.js
-contract @mozilla.org/browser/feeds/result-writer;1 {49bb6593-3aff-4eb3-a068-2712c28bd58e}
-component {792a7e82-06a0-437c-af63-b2d12e808acc} WebContentConverter.js
-contract @mozilla.org/embeddor.implemented/web-content-handler-registrar;1 {792a7e82-06a0-437c-af63-b2d12e808acc}
-category app-startup WebContentConverter service,@mozilla.org/embeddor.implemented/web-content-handler-registrar;1 application={3c2e2abc-06d4-11e1-ac3b-374f68613e61} application={ec8030f7-c20a-464f-9b0e-13a3a9e97384} application={aa3c5121-dab2-40e2-81ca-7ea25febc110} application={a23983c0-fd0e-11dc-95ff-0800200c9a66} application={d1bfe7d9-c01e-4237-998b-7b5f960a4314}
diff --git a/browser/components/feeds/FeedConverter.js b/browser/components/feeds/FeedConverter.js
deleted file mode 100644
index c2c565608..000000000
--- a/browser/components/feeds/FeedConverter.js
+++ /dev/null
@@ -1,568 +0,0 @@
-/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
-Components.utils.import("resource://gre/modules/debug.js");
-Components.utils.import("resource://gre/modules/Services.jsm");
-
-const Cc = Components.classes;
-const Ci = Components.interfaces;
-const Cr = Components.results;
-
-function LOG(str) {
-  dump("*** " + str + "\n");
-}
-
-const FS_CONTRACTID = "@mozilla.org/browser/feeds/result-service;1";
-const FPH_CONTRACTID = "@mozilla.org/network/protocol;1?name=feed";
-const PCPH_CONTRACTID = "@mozilla.org/network/protocol;1?name=pcast";
-
-const TYPE_MAYBE_FEED = "application/vnd.mozilla.maybe.feed";
-const TYPE_MAYBE_VIDEO_FEED = "application/vnd.mozilla.maybe.video.feed";
-const TYPE_MAYBE_AUDIO_FEED = "application/vnd.mozilla.maybe.audio.feed";
-const TYPE_ANY = "*/*";
-
-const PREF_SELECTED_APP = "browser.feeds.handlers.application";
-const PREF_SELECTED_WEB = "browser.feeds.handlers.webservice";
-const PREF_SELECTED_ACTION = "browser.feeds.handler";
-const PREF_SELECTED_READER = "browser.feeds.handler.default";
-
-const PREF_VIDEO_SELECTED_APP = "browser.videoFeeds.handlers.application";
-const PREF_VIDEO_SELECTED_WEB = "browser.videoFeeds.handlers.webservice";
-const PREF_VIDEO_SELECTED_ACTION = "browser.videoFeeds.handler";
-const PREF_VIDEO_SELECTED_READER = "browser.videoFeeds.handler.default";
-
-const PREF_AUDIO_SELECTED_APP = "browser.audioFeeds.handlers.application";
-const PREF_AUDIO_SELECTED_WEB = "browser.audioFeeds.handlers.webservice";
-const PREF_AUDIO_SELECTED_ACTION = "browser.audioFeeds.handler";
-const PREF_AUDIO_SELECTED_READER = "browser.audioFeeds.handler.default";
-
-function getPrefAppForType(t) {
-  switch (t) {
-    case Ci.nsIFeed.TYPE_VIDEO:
-      return PREF_VIDEO_SELECTED_APP;
-
-    case Ci.nsIFeed.TYPE_AUDIO:
-      return PREF_AUDIO_SELECTED_APP;
-
-    default:
-      return PREF_SELECTED_APP;
-  }
-}
-
-function getPrefWebForType(t) {
-  switch (t) {
-    case Ci.nsIFeed.TYPE_VIDEO:
-      return PREF_VIDEO_SELECTED_WEB;
-
-    case Ci.nsIFeed.TYPE_AUDIO:
-      return PREF_AUDIO_SELECTED_WEB;
-
-    default:
-      return PREF_SELECTED_WEB;
-  }
-}
-
-function getPrefActionForType(t) {
-  switch (t) {
-    case Ci.nsIFeed.TYPE_VIDEO:
-      return PREF_VIDEO_SELECTED_ACTION;
-
-    case Ci.nsIFeed.TYPE_AUDIO:
-      return PREF_AUDIO_SELECTED_ACTION;
-
-    default:
-      return PREF_SELECTED_ACTION;
-  }
-}
-
-function getPrefReaderForType(t) {
-  switch (t) {
-    case Ci.nsIFeed.TYPE_VIDEO:
-      return PREF_VIDEO_SELECTED_READER;
-
-    case Ci.nsIFeed.TYPE_AUDIO:
-      return PREF_AUDIO_SELECTED_READER;
-
-    default:
-      return PREF_SELECTED_READER;
-  }
-}
-
-function safeGetCharPref(pref, defaultValue) {
-  var prefs =
-      Cc["@mozilla.org/preferences-service;1"].
-      getService(Ci.nsIPrefBranch);
-  try {
-    return prefs.getCharPref(pref);
-  }
-  catch (e) {
-  }
-  return defaultValue;
-}
-
-function FeedConverter() {
-}
-FeedConverter.prototype = {
-  classID: Components.ID("{229fa115-9412-4d32-baf3-2fc407f76fb1}"),
-
-  /**
-   * This is the downloaded text data for the feed.
-   */
-  _data: null,
-
-  /**
-   * This is the object listening to the conversion, which is ultimately the
-   * docshell for the load.
-   */
-  _listener: null,
-
-  /**
-   * Records if the feed was sniffed
-   */
-  _sniffed: false,
-
-  /**
-   * See nsIStreamConverter.idl
-   */
-  convert(sourceStream, sourceType, destinationType,
-          context) {
-    throw Cr.NS_ERROR_NOT_IMPLEMENTED;
-  },
-
-  /**
-   * See nsIStreamConverter.idl
-   */
-  asyncConvertData(sourceType, destinationType,
-                   listener, context) {
-    this._listener = listener;
-  },
-
-  /**
-   * Whether or not the preview page is being forced.
-   */
-  _forcePreviewPage: false,
-
-  /**
-   * Release our references to various things once we're done using them.
-   */
-  _releaseHandles() {
-    this._listener = null;
-    this._request = null;
-    this._processor = null;
-  },
-
-  /**
-   * See nsIFeedResultListener.idl
-   */
-  handleResult(result) {
-    // Feeds come in various content types, which our feed sniffer coerces to
-    // the maybe.feed type. However, feeds are used as a transport for
-    // different data types, e.g. news/blogs (traditional feed), video/audio
-    // (podcasts) and photos (photocasts, photostreams). Each of these is
-    // different in that there's a different class of application suitable for
-    // handling feeds of that type, but without a content-type differentiation
-    // it is difficult for us to disambiguate.
-    //
-    // The other problem is that if the user specifies an auto-action handler
-    // for one feed application, the fact that the content type is shared means
-    // that all other applications will auto-load with that handler too,
-    // regardless of the content-type.
-    //
-    // This means that content-type alone is not enough to determine whether
-    // or not a feed should be auto-handled. This means that for feeds we need
-    // to always use this stream converter, even when an auto-action is
-    // specified, not the basic one provided by WebContentConverter. This
-    // converter needs to consume all of the data and parse it, and based on
-    // that determination make a judgment about type.
-    //
-    // Since there are no content types for this content, and I'm not going to
-    // invent any, the upshot is that while a user can set an auto-handler for
-    // generic feed content, the system will prevent them from setting an auto-
-    // handler for other stream types. In those cases, the user will always see
-    // the preview page and have to select a handler. We can guess and show
-    // a client handler, but will not be able to show web handlers for those
-    // types.
-    //
-    // If this is just a feed, not some kind of specialized application, then
-    // auto-handlers can be set and we should obey them.
-    try {
-      let feedService =
-          Cc["@mozilla.org/browser/feeds/result-service;1"].
-          getService(Ci.nsIFeedResultService);
-      if (!this._forcePreviewPage && result.doc) {
-        let feed = result.doc.QueryInterface(Ci.nsIFeed);
-        let handler = safeGetCharPref(getPrefActionForType(feed.type), "ask");
-
-        if (handler != "ask") {
-          if (handler == "reader")
-            handler = safeGetCharPref(getPrefReaderForType(feed.type), "bookmarks");
-          switch (handler) {
-            case "web":
-              let wccr =
-                  Cc["@mozilla.org/embeddor.implemented/web-content-handler-registrar;1"].
-                  getService(Ci.nsIWebContentConverterService);
-              if ((feed.type == Ci.nsIFeed.TYPE_FEED &&
-                   wccr.getAutoHandler(TYPE_MAYBE_FEED)) ||
-                  (feed.type == Ci.nsIFeed.TYPE_VIDEO &&
-                   wccr.getAutoHandler(TYPE_MAYBE_VIDEO_FEED)) ||
-                  (feed.type == Ci.nsIFeed.TYPE_AUDIO &&
-                   wccr.getAutoHandler(TYPE_MAYBE_AUDIO_FEED))) {
-                wccr.loadPreferredHandler(this._request);
-                return;
-              }
-              break;
-
-            default:
-              LOG("unexpected handler: " + handler);
-              // fall through -- let feed service handle error
-            case "bookmarks":
-            case "client":
-            case "default":
-              try {
-                let title = feed.title ? feed.title.plainText() : "";
-                let desc = feed.subtitle ? feed.subtitle.plainText() : "";
-                feedService.addToClientReader(result.uri.spec, title, desc, feed.type, handler);
-                return;
-              } catch (ex) { /* fallback to preview mode */ }
-          }
-        }
-      }
-
-      let ios =
-          Cc["@mozilla.org/network/io-service;1"].
-          getService(Ci.nsIIOService);
-      let chromeChannel;
-
-      // handling a redirect, hence forwarding the loadInfo from the old channel
-      // to the newchannel.
-      let oldChannel = this._request.QueryInterface(Ci.nsIChannel);
-      let loadInfo = oldChannel.loadInfo;
-
-      // If there was no automatic handler, or this was a podcast,
-      // photostream or some other kind of application, show the preview page
-      // if the parser returned a document.
-      if (result.doc) {
-
-        // Store the result in the result service so that the display
-        // page can access it.
-        feedService.addFeedResult(result);
-
-        // Now load the actual XUL document.
-        let aboutFeedsURI = ios.newURI("about:feeds", null, null);
-        chromeChannel = ios.newChannelFromURIWithLoadInfo(aboutFeedsURI, loadInfo);
-        chromeChannel.originalURI = result.uri;
-
-        // carry the origin attributes from the channel that loaded the feed.
-        chromeChannel.owner =
-          Services.scriptSecurityManager.createCodebasePrincipal(aboutFeedsURI,
-                                                                 loadInfo.originAttributes);
-      } else {
-        chromeChannel = ios.newChannelFromURIWithLoadInfo(result.uri, loadInfo);
-      }
-
-      chromeChannel.loadGroup = this._request.loadGroup;
-      chromeChannel.asyncOpen2(this._listener);
-    }
-    finally {
-      this._releaseHandles();
-    }
-  },
-
-  /**
-   * See nsIStreamListener.idl
-   */
-  onDataAvailable(request, context, inputStream,
-                  sourceOffset, count) {
-    if (this._processor)
-      this._processor.onDataAvailable(request, context, inputStream,
-                                      sourceOffset, count);
-  },
-
-  /**
-   * See nsIRequestObserver.idl
-   */
-  onStartRequest(request, context) {
-    let channel = request.QueryInterface(Ci.nsIChannel);
-
-    // Check for a header that tells us there was no sniffing
-    // The value doesn't matter.
-    try {
-      let httpChannel = channel.QueryInterface(Ci.nsIHttpChannel);
-      // Make sure to check requestSucceeded before the potentially-throwing
-      // getResponseHeader.
-      if (!httpChannel.requestSucceeded) {
-        // Just give up, but don't forget to cancel the channel first!
-        request.cancel(Cr.NS_BINDING_ABORTED);
-        return;
-      }
-
-      // Note: this throws if the header is not set.
-      httpChannel.getResponseHeader("X-Moz-Is-Feed");
-    }
-    catch (ex) {
-      this._sniffed = true;
-    }
-
-    this._request = request;
-
-    // Save and reset the forced state bit early, in case there's some kind of
-    // error.
-    let feedService =
-        Cc["@mozilla.org/browser/feeds/result-service;1"].
-        getService(Ci.nsIFeedResultService);
-    this._forcePreviewPage = feedService.forcePreviewPage;
-    feedService.forcePreviewPage = false;
-
-    // Parse feed data as it comes in
-    this._processor =
-        Cc["@mozilla.org/feed-processor;1"].
-        createInstance(Ci.nsIFeedProcessor);
-    this._processor.listener = this;
-    this._processor.parseAsync(null, channel.URI);
-
-    this._processor.onStartRequest(request, context);
-  },
-
-  /**
-   * See nsIRequestObserver.idl
-   */
-  onStopRequest(request, context, status) {
-    if (this._processor)
-      this._processor.onStopRequest(request, context, status);
-  },
-
-  /**
-   * See nsISupports.idl
-   */
-  QueryInterface(iid) {
-    if (iid.equals(Ci.nsIFeedResultListener) ||
-        iid.equals(Ci.nsIStreamConverter) ||
-        iid.equals(Ci.nsIStreamListener) ||
-        iid.equals(Ci.nsIRequestObserver)||
-        iid.equals(Ci.nsISupports))
-      return this;
-    throw Cr.NS_ERROR_NO_INTERFACE;
-  },
-};
-
-/**
- * Keeps parsed FeedResults around for use elsewhere in the UI after the stream
- * converter completes.
- */
-function FeedResultService() {
-}
-
-FeedResultService.prototype = {
-  classID: Components.ID("{2376201c-bbc6-472f-9b62-7548040a61c6}"),
-
-  /**
-   * A URI spec -> [nsIFeedResult] hash. We have to keep a list as the
-   * value in case the same URI is requested concurrently.
-   */
-  _results: { },
-
-  /**
-   * See nsIFeedResultService.idl
-   */
-  forcePreviewPage: false,
-
-  /**
-   * See nsIFeedResultService.idl
-   */
-  addToClientReader(spec, title, subtitle, feedType, feedReader) {
-    if (!feedReader) {
-      feedReader = "default";
-    }
-
-    let handler = safeGetCharPref(getPrefActionForType(feedType), "bookmarks");
-    if (handler == "ask" || handler == "reader")
-      handler = feedReader;
-
-    switch (handler) {
-    case "client":
-      Services.cpmm.sendAsyncMessage("FeedConverter:ExecuteClientApp",
-                                     { spec,
-                                       title,
-                                       subtitle,
-                                       feedHandler: getPrefAppForType(feedType) });
-      break;
-    case "default":
-      // Default system feed reader
-      Services.cpmm.sendAsyncMessage("FeedConverter:ExecuteClientApp",
-                                     { spec,
-                                       title,
-                                       subtitle,
-                                       feedHandler: "default" });
-      break;
-    default:
-      // "web" should have been handled elsewhere
-      LOG("unexpected handler: " + handler);
-      // fall through
-    case "bookmarks":
-      Services.cpmm.sendAsyncMessage("FeedConverter:addLiveBookmark",
-                                     { spec, title, subtitle });
-      break;
-    }
-  },
-
-  /**
-   * See nsIFeedResultService.idl
-   */
-  addFeedResult(feedResult) {
-    NS_ASSERT(feedResult.uri != null, "null URI!");
-    NS_ASSERT(feedResult.uri != null, "null feedResult!");
-    let spec = feedResult.uri.spec;
-    if (!this._results[spec])
-      this._results[spec] = [];
-    this._results[spec].push(feedResult);
-  },
-
-  /**
-   * See nsIFeedResultService.idl
-   */
-  getFeedResult(uri) {
-    NS_ASSERT(uri != null, "null URI!");
-    let resultList = this._results[uri.spec];
-    for (let result of resultList) {
-      if (result.uri == uri)
-        return result;
-    }
-    return null;
-  },
-
-  /**
-   * See nsIFeedResultService.idl
-   */
-  removeFeedResult(uri) {
-    NS_ASSERT(uri != null, "null URI!");
-    let resultList = this._results[uri.spec];
-    if (!resultList)
-      return;
-    let deletions = 0;
-    for (let i = 0; i < resultList.length; ++i) {
-      if (resultList[i].uri == uri) {
-        delete resultList[i];
-        ++deletions;
-      }
-    }
-
-    // send the holes to the end
-    resultList.sort();
-    // and trim the list
-    resultList.splice(resultList.length - deletions, deletions);
-    if (resultList.length == 0)
-      delete this._results[uri.spec];
-  },
-
-  createInstance(outer, iid) {
-    if (outer != null)
-      throw Cr.NS_ERROR_NO_AGGREGATION;
-    return this.QueryInterface(iid);
-  },
-
-  QueryInterface(iid) {
-    if (iid.equals(Ci.nsIFeedResultService) ||
-        iid.equals(Ci.nsIFactory) ||
-        iid.equals(Ci.nsISupports))
-      return this;
-    throw Cr.NS_ERROR_NOT_IMPLEMENTED;
-  },
-};
-
-/**
- * A protocol handler that attempts to deal with the variant forms of feed:
- * URIs that are actually either http or https.
- */
-function GenericProtocolHandler() {
-}
-GenericProtocolHandler.prototype = {
-  _init(scheme) {
-    let ios =
-      Cc["@mozilla.org/network/io-service;1"].
-      getService(Ci.nsIIOService);
-    this._http = ios.getProtocolHandler("http");
-    this._scheme = scheme;
-  },
-
-  get scheme() {
-    return this._scheme;
-  },
-
-  get protocolFlags() {
-    let {URI_DANGEROUS_TO_LOAD, ALLOWS_PROXY_HTTP, ALLOWS_PROXY} =
-      Ci.nsIProtocolHandler;
-    return URI_DANGEROUS_TO_LOAD | ALLOWS_PROXY | ALLOWS_PROXY_HTTP;
-  },
-
-  get defaultPort() {
-    return this._http.defaultPort;
-  },
-
-  allowPort(port, scheme) {
-    return this._http.allowPort(port, scheme);
-  },
-
-  newURI(spec, originalCharset, baseURI) {
-    // Feed URIs can be either nested URIs of the form feed:realURI (in which
-    // case we create a nested URI for the realURI) or feed://example.com, in
-    // which case we create a nested URI for the real protocol which is http.
-
-    let scheme = this._scheme + ":";
-    if (spec.substr(0, scheme.length) != scheme)
-      throw Cr.NS_ERROR_MALFORMED_URI;
-
-    let prefix = spec.substr(scheme.length, 2) == "//" ? "http:" : "";
-    let inner = Services.io.newURI(spec.replace(scheme, prefix),
-                                   originalCharset, baseURI);
-
-    if (!["http", "https"].includes(inner.scheme))
-      throw Cr.NS_ERROR_MALFORMED_URI;
-
-    let uri = Services.io.QueryInterface(Ci.nsINetUtil).newSimpleNestedURI(inner);
-    uri.spec = inner.spec.replace(prefix, scheme);
-    return uri;
-  },
-
-  newChannel2(aUri, aLoadInfo) {
-    let inner = aUri.QueryInterface(Ci.nsINestedURI).innerURI;
-    let channel = Cc["@mozilla.org/network/io-service;1"].
-                  getService(Ci.nsIIOService).
-                  newChannelFromURIWithLoadInfo(inner, aLoadInfo);
-
-    if (channel instanceof Components.interfaces.nsIHttpChannel)
-      // Set this so we know this is supposed to be a feed
-      channel.setRequestHeader("X-Moz-Is-Feed", "1", false);
-    channel.originalURI = aUri;
-    return channel;
-  },
-
-  QueryInterface(iid) {
-    if (iid.equals(Ci.nsIProtocolHandler) ||
-        iid.equals(Ci.nsISupports))
-      return this;
-    throw Cr.NS_ERROR_NO_INTERFACE;
-  }
-};
-
-function FeedProtocolHandler() {
-  this._init('feed');
-}
-FeedProtocolHandler.prototype = new GenericProtocolHandler();
-FeedProtocolHandler.prototype.classID = Components.ID("{4f91ef2e-57ba-472e-ab7a-b4999e42d6c0}");
-
-function PodCastProtocolHandler() {
-  this._init('pcast');
-}
-PodCastProtocolHandler.prototype = new GenericProtocolHandler();
-PodCastProtocolHandler.prototype.classID = Components.ID("{1c31ed79-accd-4b94-b517-06e0c81999d5}");
-
-var components = [FeedConverter,
-                  FeedResultService,
-                  FeedProtocolHandler,
-                  PodCastProtocolHandler];
-
-
-this.NSGetFactory = XPCOMUtils.generateNSGetFactory(components);
diff --git a/browser/components/feeds/FeedWriter.js b/browser/components/feeds/FeedWriter.js
deleted file mode 100644
index 20f1399b0..000000000
--- a/browser/components/feeds/FeedWriter.js
+++ /dev/null
@@ -1,1007 +0,0 @@
-/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-const Cc = Components.classes;
-const Ci = Components.interfaces;
-const Cr = Components.results;
-const Cu = Components.utils;
-
-Cu.import("resource://gre/modules/XPCOMUtils.jsm");
-Cu.import("resource://gre/modules/Services.jsm");
-Cu.import("resource://gre/modules/NetUtil.jsm");
-
-const FEEDWRITER_CID = Components.ID("{49bb6593-3aff-4eb3-a068-2712c28bd58e}");
-const FEEDWRITER_CONTRACTID = "@mozilla.org/browser/feeds/result-writer;1";
-
-function LOG(str) {
-  let prefB = Cc["@mozilla.org/preferences-service;1"].
-              getService(Ci.nsIPrefBranch);
-
-  let shouldLog = false;
-  try {
-    shouldLog = prefB.getBoolPref("feeds.log");
-  }
-  catch (ex) {
-  }
-
-  if (shouldLog)
-    dump("*** Feeds: " + str + "\n");
-}
-
-/**
- * Wrapper function for nsIIOService::newURI.
- * @param aURLSpec
- *        The URL string from which to create an nsIURI.
- * @returns an nsIURI object, or null if the creation of the URI failed.
- */
-function makeURI(aURLSpec, aCharset) {
-  let ios = Cc["@mozilla.org/network/io-service;1"].
-            getService(Ci.nsIIOService);
-  try {
-    return ios.newURI(aURLSpec, aCharset, null);
-  } catch (ex) { }
-
-  return null;
-}
-
-const XML_NS = "http://www.w3.org/XML/1998/namespace";
-const HTML_NS = "http://www.w3.org/1999/xhtml";
-const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
-const URI_BUNDLE = "chrome://browser/locale/feeds/subscribe.properties";
-
-const TITLE_ID = "feedTitleText";
-const SUBTITLE_ID = "feedSubtitleText";
-
-/**
- * Converts a number of bytes to the appropriate unit that results in a
- * number that needs fewer than 4 digits
- *
- * @return a pair: [new value with 3 sig. figs., its unit]
-  */
-function convertByteUnits(aBytes) {
-  let units = ["bytes", "kilobyte", "megabyte", "gigabyte"];
-  let unitIndex = 0;
-
-  // convert to next unit if it needs 4 digits (after rounding), but only if
-  // we know the name of the next unit
-  while ((aBytes >= 999.5) && (unitIndex < units.length - 1)) {
-    aBytes /= 1024;
-    unitIndex++;
-  }
-
-  // Get rid of insignificant bits by truncating to 1 or 0 decimal points
-  // 0 -> 0; 1.2 -> 1.2; 12.3 -> 12.3; 123.4 -> 123; 234.5 -> 235
-  aBytes = aBytes.toFixed((aBytes > 0) && (aBytes < 100) ? 1 : 0);
-
-  return [aBytes, units[unitIndex]];
-}
-
-function FeedWriter() {
-  this._selectedApp = undefined;
-  this._selectedAppMenuItem = null;
-  this._subscribeCallback = null;
-  this._defaultHandlerMenuItem = null;
-}
-
-FeedWriter.prototype = {
-  _getPropertyAsBag(container, property) {
-    return container.fields.getProperty(property).
-                     QueryInterface(Ci.nsIPropertyBag2);
-  },
-
-  _getPropertyAsString(container, property) {
-    try {
-      return container.fields.getPropertyAsAString(property);
-    }
-    catch (e) {
-    }
-    return "";
-  },
-
-  _setContentText(id, text) {
-    let element = this._document.getElementById(id);
-    let textNode = text.createDocumentFragment(element);
-    while (element.hasChildNodes())
-      element.removeChild(element.firstChild);
-    element.appendChild(textNode);
-    if (text.base) {
-      element.setAttributeNS(XML_NS, 'base', text.base.spec);
-    }
-  },
-
-  /**
-   * Safely sets the href attribute on an anchor tag, providing the URI
-   * specified can be loaded according to rules.
-   * @param   element
-   *          The element to set a URI attribute on
-   * @param   attribute
-   *          The attribute of the element to set the URI to, e.g. href or src
-   * @param   uri
-   *          The URI spec to set as the href
-   */
-  _safeSetURIAttribute(element, attribute, uri) {
-    let secman = Cc["@mozilla.org/scriptsecuritymanager;1"].
-                 getService(Ci.nsIScriptSecurityManager);
-    const flags = Ci.nsIScriptSecurityManager.DISALLOW_INHERIT_PRINCIPAL;
-    try {
-      // TODO Is this necessary?
-      secman.checkLoadURIStrWithPrincipal(this._feedPrincipal, uri, flags);
-      // checkLoadURIStrWithPrincipal will throw if the link URI should not be
-      // loaded, either because our feedURI isn't allowed to load it or per
-      // the rules specified in |flags|, so we'll never "linkify" the link...
-    }
-    catch (e) {
-      // Not allowed to load this link because secman.checkLoadURIStr threw
-      return;
-    }
-
-    element.setAttribute(attribute, uri);
-  },
-
-  __bundle: null,
-  get _bundle() {
-    if (!this.__bundle) {
-      this.__bundle = Cc["@mozilla.org/intl/stringbundle;1"].
-                      getService(Ci.nsIStringBundleService).
-                      createBundle(URI_BUNDLE);
-    }
-    return this.__bundle;
-  },
-
-  _getFormattedString(key, params) {
-    return this._bundle.formatStringFromName(key, params, params.length);
-  },
-
-  _getString(key) {
-    return this._bundle.GetStringFromName(key);
-  },
-
-  _setCheckboxCheckedState(aValue) {
-    let checkbox = this._document.getElementById("alwaysUse");
-    if (checkbox) {
-      // see checkbox.xml, xbl bindings are not applied within the sandbox! TODO
-      let change = (aValue != (checkbox.getAttribute("checked") == "true"));
-      if (aValue)
-        checkbox.setAttribute("checked", "true");
-      else
-        checkbox.removeAttribute("checked");
-
-      if (change) {
-        let event = this._document.createEvent("Events");
-        event.initEvent("CheckboxStateChange", true, true);
-        checkbox.dispatchEvent(event);
-      }
-    }
-  },
-
-   /**
-   * Returns a date suitable for displaying in the feed preview.
-   * If the date cannot be parsed, the return value is "false".
-   * @param   dateString
-   *          A date as extracted from a feed entry. (entry.updated)
-   */
-  _parseDate(dateString) {
-    // Convert the date into the user's local time zone
-    let dateObj = new Date(dateString);
-
-    // Make sure the date we're given is valid.
-    if (!dateObj.getTime())
-      return false;
-
-    return this._dateFormatter.format(dateObj);
-  },
-
-  __dateFormatter: null,
-  get _dateFormatter() {
-    if (!this.__dateFormatter) {
-      const locale = Cc["@mozilla.org/chrome/chrome-registry;1"]
-                     .getService(Ci.nsIXULChromeRegistry)
-                     .getSelectedLocale("global", true);
-      const dtOptions = { year: 'numeric', month: 'long', day: 'numeric',
-                          hour: 'numeric', minute: 'numeric' };
-      this.__dateFormatter = new Intl.DateTimeFormat(locale, dtOptions);
-    }
-    return this.__dateFormatter;
-  },
-
-  /**
-   * Returns the feed type.
-   */
-  __feedType: null,
-  _getFeedType() {
-    if (this.__feedType != null)
-      return this.__feedType;
-
-    try {
-      // grab the feed because it's got the feed.type in it.
-      let container = this._getContainer();
-      let feed = container.QueryInterface(Ci.nsIFeed);
-      this.__feedType = feed.type;
-      return feed.type;
-    } catch (ex) { }
-
-    return Ci.nsIFeed.TYPE_FEED;
-  },
-
-  /**
-   * Writes the feed title into the preview document.
-   * @param   container
-   *          The feed container
-   */
-  _setTitleText(container) {
-    if (container.title) {
-      let title = container.title.plainText();
-      this._setContentText(TITLE_ID, container.title);
-      this._document.title = title;
-    }
-
-    let feed = container.QueryInterface(Ci.nsIFeed);
-    if (feed && feed.subtitle)
-      this._setContentText(SUBTITLE_ID, container.subtitle);
-  },
-
-  /**
-   * Writes the title image into the preview document if one is present.
-   * @param   container
-   *          The feed container
-   */
-  _setTitleImage(container) {
-    try {
-      let parts = container.image;
-
-      // Set up the title image (supplied by the feed)
-      let feedTitleImage = this._document.getElementById("feedTitleImage");
-      this._safeSetURIAttribute(feedTitleImage, "src",
-                                parts.getPropertyAsAString("url"));
-
-      // Set up the title image link
-      let feedTitleLink = this._document.getElementById("feedTitleLink");
-
-      let titleText = this._getFormattedString("linkTitleTextFormat",
-                                               [parts.getPropertyAsAString("title")]);
-      let feedTitleText = this._document.getElementById("feedTitleText");
-      let titleImageWidth = parseInt(parts.getPropertyAsAString("width")) + 15;
-
-      // Fix the margin on the main title, so that the image doesn't run over
-      // the underline
-      feedTitleLink.setAttribute('title', titleText);
-      feedTitleText.style.marginRight = titleImageWidth + 'px';
-
-      this._safeSetURIAttribute(feedTitleLink, "href",
-                                parts.getPropertyAsAString("link"));
-    }
-    catch (e) {
-      LOG("Failed to set Title Image (this is benign): " + e);
-    }
-  },
-
-  /**
-   * Writes all entries contained in the feed.
-   * @param   container
-   *          The container of entries in the feed
-   */
-  _writeFeedContent(container) {
-    // Build the actual feed content
-    let feed = container.QueryInterface(Ci.nsIFeed);
-    if (feed.items.length == 0)
-      return;
-
-    let feedContent = this._document.getElementById("feedContent");
-
-    for (let i = 0; i < feed.items.length; ++i) {
-      let entry = feed.items.queryElementAt(i, Ci.nsIFeedEntry);
-      entry.QueryInterface(Ci.nsIFeedContainer);
-
-      let entryContainer = this._document.createElementNS(HTML_NS, "div");
-      entryContainer.className = "entry";
-
-      // If the entry has a title, make it a link
-      if (entry.title) {
-        let a = this._document.createElementNS(HTML_NS, "a");
-        let span = this._document.createElementNS(HTML_NS, "span");
-        a.appendChild(span);
-        if (entry.title.base)
-          span.setAttributeNS(XML_NS, "base", entry.title.base.spec);
-        span.appendChild(entry.title.createDocumentFragment(a));
-
-        // Entries are not required to have links, so entry.link can be null.
-        if (entry.link)
-          this._safeSetURIAttribute(a, "href", entry.link.spec);
-
-        let title = this._document.createElementNS(HTML_NS, "h3");
-        title.appendChild(a);
-
-        let lastUpdated = this._parseDate(entry.updated);
-        if (lastUpdated) {
-          let dateDiv = this._document.createElementNS(HTML_NS, "div");
-          dateDiv.className = "lastUpdated";
-          dateDiv.textContent = lastUpdated;
-          title.appendChild(dateDiv);
-        }
-
-        entryContainer.appendChild(title);
-      }
-
-      let body = this._document.createElementNS(HTML_NS, "div");
-      let summary = entry.summary || entry.content;
-      let docFragment = null;
-      if (summary) {
-        if (summary.base)
-          body.setAttributeNS(XML_NS, "base", summary.base.spec);
-        else
-          LOG("no base?");
-        docFragment = summary.createDocumentFragment(body);
-        if (docFragment)
-          body.appendChild(docFragment);
-
-        // If the entry doesn't have a title, append a # permalink
-        // See http://scripting.com/rss.xml for an example
-        if (!entry.title && entry.link) {
-          let a = this._document.createElementNS(HTML_NS, "a");
-          a.appendChild(this._document.createTextNode("#"));
-          this._safeSetURIAttribute(a, "href", entry.link.spec);
-          body.appendChild(this._document.createTextNode(" "));
-          body.appendChild(a);
-        }
-
-      }
-      body.className = "feedEntryContent";
-      entryContainer.appendChild(body);
-
-      if (entry.enclosures && entry.enclosures.length > 0) {
-        let enclosuresDiv = this._buildEnclosureDiv(entry);
-        entryContainer.appendChild(enclosuresDiv);
-      }
-
-      let clearDiv = this._document.createElementNS(HTML_NS, "div");
-      clearDiv.style.clear = "both";
-
-      feedContent.appendChild(entryContainer);
-      feedContent.appendChild(clearDiv);
-    }
-  },
-
-  /**
-   * Takes a url to a media item and returns the best name it can come up with.
-   * Frequently this is the filename portion (e.g. passing in
-   * http://example.com/foo.mpeg would return "foo.mpeg"), but in more complex
-   * cases, this will return the entire url (e.g. passing in
-   * http://example.com/somedirectory/ would return
-   * http://example.com/somedirectory/).
-   * @param aURL
-   *        The URL string from which to create a display name
-   * @returns a string
-   */
-  _getURLDisplayName(aURL) {
-    let url = makeURI(aURL);
-    url.QueryInterface(Ci.nsIURL);
-    if (url == null || url.fileName.length == 0)
-      return decodeURIComponent(aURL);
-
-    return decodeURIComponent(url.fileName);
-  },
-
-  /**
-   * Takes a FeedEntry with enclosures, generates the HTML code to represent
-   * them, and returns that.
-   * @param   entry
-   *          FeedEntry with enclosures
-   * @returns element
-   */
-  _buildEnclosureDiv(entry) {
-    let enclosuresDiv = this._document.createElementNS(HTML_NS, "div");
-    enclosuresDiv.className = "enclosures";
-
-    enclosuresDiv.appendChild(this._document.createTextNode(this._getString("mediaLabel")));
-
-    for (let i_enc = 0; i_enc < entry.enclosures.length; ++i_enc) {
-      let enc = entry.enclosures.queryElementAt(i_enc, Ci.nsIWritablePropertyBag2);
-
-      if (!(enc.hasKey("url")))
-        continue;
-
-      let enclosureDiv = this._document.createElementNS(HTML_NS, "div");
-      enclosureDiv.setAttribute("class", "enclosure");
-
-      let mozicon = "moz-icon://.txt?size=16";
-      let type_text = null;
-      let size_text = null;
-
-      if (enc.hasKey("type")) {
-        type_text = enc.get("type");
-        if (enc.hasKey("typeDesc"))
-          type_text = enc.get("typeDesc");
-
-        if (type_text && type_text.length > 0)
-          mozicon = "moz-icon://goat?size=16&contentType=" + enc.get("type");
-      }
-
-      if (enc.hasKey("length") && /^[0-9]+$/.test(enc.get("length"))) {
-        let enc_size = convertByteUnits(parseInt(enc.get("length")));
-
-        size_text = this._getFormattedString("enclosureSizeText",
-                                             [enc_size[0],
-                                             this._getString(enc_size[1])]);
-      }
-
-      let iconimg = this._document.createElementNS(HTML_NS, "img");
-      iconimg.setAttribute("src", mozicon);
-      iconimg.setAttribute("class", "type-icon");
-      enclosureDiv.appendChild(iconimg);
-
-      enclosureDiv.appendChild(this._document.createTextNode( " " ));
-
-      let enc_href = this._document.createElementNS(HTML_NS, "a");
-      enc_href.appendChild(this._document.createTextNode(this._getURLDisplayName(enc.get("url"))));
-      this._safeSetURIAttribute(enc_href, "href", enc.get("url"));
-      enclosureDiv.appendChild(enc_href);
-
-      if (type_text && size_text)
-        enclosureDiv.appendChild(this._document.createTextNode( " (" + type_text + ", " + size_text + ")"));
-
-      else if (type_text)
-        enclosureDiv.appendChild(this._document.createTextNode( " (" + type_text + ")"))
-
-      else if (size_text)
-        enclosureDiv.appendChild(this._document.createTextNode( " (" + size_text + ")"))
-
-      enclosuresDiv.appendChild(enclosureDiv);
-    }
-
-    return enclosuresDiv;
-  },
-
-  /**
-   * Gets a valid nsIFeedContainer object from the parsed nsIFeedResult.
-   * Displays error information if there was one.
-   * @returns A valid nsIFeedContainer object containing the contents of
-   *          the feed.
-   */
-  _getContainer() {
-    let feedService =
-        Cc["@mozilla.org/browser/feeds/result-service;1"].
-        getService(Ci.nsIFeedResultService);
-
-    let result;
-    try {
-      result =
-        feedService.getFeedResult(this._getOriginalURI(this._window));
-    }
-    catch (e) {
-      LOG("Subscribe Preview: feed not available?!");
-    }
-
-    if (result.bozo) {
-      LOG("Subscribe Preview: feed result is bozo?!");
-    }
-
-    let container;
-    try {
-      container = result.doc;
-    }
-    catch (e) {
-      LOG("Subscribe Preview: no result.doc? Why didn't the original reload?");
-      return null;
-    }
-    return container;
-  },
-
-  /**
-   * Get moz-icon url for a file
-   * @param   file
-   *          A nsIFile object for which the moz-icon:// is returned
-   * @returns moz-icon url of the given file as a string
-   */
-  _getFileIconURL(file) {
-    let ios = Cc["@mozilla.org/network/io-service;1"].
-              getService(Ci.nsIIOService);
-    let fph = ios.getProtocolHandler("file")
-                 .QueryInterface(Ci.nsIFileProtocolHandler);
-    let urlSpec = fph.getURLSpecFromFile(file);
-    return "moz-icon://" + urlSpec + "?size=16";
-  },
-
-  /**
-   * Displays a prompt from which the user may choose a (client) feed reader.
-   * @param aCallback the callback method, passes in true if a feed reader was
-   *        selected, false otherwise.
-   */
-  _chooseClientApp(aCallback) {
-    this._subscribeCallback = aCallback;
-    this._mm.sendAsyncMessage("FeedWriter:ChooseClientApp",
-                              { title: this._getString("chooseApplicationDialogTitle"),
-                                feedType: this._getFeedType() });
-  },
-
-  _setSubscribeUsingLabel() {
-    let stringLabel = "subscribeFeedUsing";
-    switch (this._getFeedType()) {
-      case Ci.nsIFeed.TYPE_VIDEO:
-        stringLabel = "subscribeVideoPodcastUsing";
-        break;
-
-      case Ci.nsIFeed.TYPE_AUDIO:
-        stringLabel = "subscribeAudioPodcastUsing";
-        break;
-    }
-
-    let subscribeUsing = this._document.getElementById("subscribeUsingDescription");
-    let textNode = this._document.createTextNode(this._getString(stringLabel));
-    subscribeUsing.insertBefore(textNode, subscribeUsing.firstChild);
-  },
-
-  _setAlwaysUseLabel() {
-    let checkbox = this._document.getElementById("alwaysUse");
-    if (checkbox && this._handlersList) {
-      let handlerName = this._handlersList.selectedOptions[0]
-                            .textContent;
-      let stringLabel = "alwaysUseForFeeds";
-      switch (this._getFeedType()) {
-        case Ci.nsIFeed.TYPE_VIDEO:
-          stringLabel = "alwaysUseForVideoPodcasts";
-          break;
-
-        case Ci.nsIFeed.TYPE_AUDIO:
-          stringLabel = "alwaysUseForAudioPodcasts";
-          break;
-      }
-
-      let label = this._getFormattedString(stringLabel, [handlerName]);
-
-      let checkboxText = this._document.getElementById("checkboxText");
-      if (checkboxText.lastChild.nodeType == checkboxText.TEXT_NODE) {
-        checkboxText.lastChild.textContent = label;
-      } else {
-        LOG("FeedWriter._setAlwaysUseLabel: Expected textNode as lastChild of alwaysUse label");
-        let textNode = this._document.createTextNode(label);
-        checkboxText.appendChild(textNode);
-      }
-    }
-  },
-
-  // nsIDomEventListener
-  handleEvent(event) {
-    if (event.target.ownerDocument != this._document) {
-      LOG("FeedWriter.handleEvent: Someone passed the feed writer as a listener to the events of another document!");
-      return;
-    }
-
-    switch (event.type) {
-      case "click":
-        if (event.target.id == "subscribeButton") {
-          this.subscribe();
-        }
-      break;
-      case "change":
-        LOG("Change fired");
-        if (event.target.selectedOptions[0].id == "chooseApplicationMenuItem") {
-          this._chooseClientApp(() => {
-            // Select the (per-prefs) selected handler if no application
-            // was selected
-            LOG("Selected handler after callback");
-            this._setAlwaysUseLabel();
-          });
-        } else {
-          this._setAlwaysUseLabel();
-        }
-        break;
-    }
-  },
-
-  _getWebHandlerElementsForURL(aURL) {
-    return this._handlersList.querySelectorAll('[webhandlerurl="' + aURL + '"]');
-  },
-
-  _setSelectedHandlerResponse(handler, url) {
-    LOG(`Selecting handler response ${handler} ${url}`);
-    switch (handler) {
-      case "web": {
-        if (this._handlersList) {
-          let handlers =
-            this._getWebHandlerElementsForURL(url);
-          if (handlers.length == 0) {
-            LOG(`Selected web handler isn't in the menulist ${url}`);
-            return;
-          }
-
-          handlers[0].selected = true;
-        }
-        break;
-      }
-      case "client":
-      case "default":
-        // do nothing, these are handled by the onchange event
-        break;
-      case "bookmarks":
-      default: {
-        let liveBookmarksMenuItem = this._document.getElementById("liveBookmarksMenuItem");
-        if (liveBookmarksMenuItem)
-          liveBookmarksMenuItem.selected = true;
-      }
-    }
-  },
-
-  _initSubscriptionUI(setupMessage) {
-    if (!this._handlersList)
-      return;
-    LOG("UI init");
-
-    let feedType = this._getFeedType();
-
-    // change the background
-    let header = this._document.getElementById("feedHeader");
-    switch (feedType) {
-      case Ci.nsIFeed.TYPE_VIDEO:
-        header.className = 'videoPodcastBackground';
-        break;
-
-      case Ci.nsIFeed.TYPE_AUDIO:
-        header.className = 'audioPodcastBackground';
-        break;
-
-      default:
-        header.className = 'feedBackground';
-    }
-
-    let liveBookmarksMenuItem = this._document.getElementById("liveBookmarksMenuItem");
-
-    // Last-selected application
-    let menuItem = liveBookmarksMenuItem.cloneNode(false);
-    menuItem.removeAttribute("selected");
-    menuItem.setAttribute("id", "selectedAppMenuItem");
-    menuItem.setAttribute("handlerType", "client");
-
-    // Hide the menuitem until we select an app
-    menuItem.style.display = "none";
-    this._selectedAppMenuItem = menuItem;
-
-    this._handlersList.appendChild(this._selectedAppMenuItem);
-
-    // Create the menuitem for the default reader, but don't show/populate it until
-    // we get confirmation of what it is from the parent
-    menuItem = liveBookmarksMenuItem.cloneNode(false);
-    menuItem.removeAttribute("selected");
-    menuItem.setAttribute("id", "defaultHandlerMenuItem");
-    menuItem.setAttribute("handlerType", "client");
-    menuItem.style.display = "none";
-
-    this._defaultHandlerMenuItem = menuItem;
-    this._handlersList.appendChild(this._defaultHandlerMenuItem);
-
-    // "Choose Application..." menuitem
-    menuItem = liveBookmarksMenuItem.cloneNode(false);
-    menuItem.removeAttribute("selected");
-    menuItem.setAttribute("id", "chooseApplicationMenuItem");
-    menuItem.textContent = this._getString("chooseApplicationMenuItem");
-
-    this._handlersList.appendChild(menuItem);
-
-    // separator
-    let chooseAppSep = liveBookmarksMenuItem.nextElementSibling.cloneNode(false);
-    chooseAppSep.textContent = liveBookmarksMenuItem.nextElementSibling.textContent;
-    this._handlersList.appendChild(chooseAppSep);
-
-    for (let handler of setupMessage.handlers) {
-      if (!handler.uri) {
-        LOG("Handler with name " + handler.name + " has no URI!? Skipping...");
-        continue;
-      }
-      menuItem = liveBookmarksMenuItem.cloneNode(false);
-      menuItem.removeAttribute("selected");
-      menuItem.className = "menuitem-iconic";
-      menuItem.textContent = handler.name;
-      menuItem.setAttribute("handlerType", "web");
-      menuItem.setAttribute("webhandlerurl", handler.uri);
-      this._handlersList.appendChild(menuItem);
-    }
-
-    this._setSelectedHandlerResponse(setupMessage.reader.handler, setupMessage.reader.url);
-
-    if (setupMessage.defaultMenuItem) {
-      LOG(`Setting default menu item ${setupMessage.defaultMenuItem}`);
-      this._setApplicationLauncherMenuItem(this._defaultHandlerMenuItem, setupMessage.defaultMenuItem);
-    }
-    if (setupMessage.selectedMenuItem) {
-      LOG(`Setting selected menu item ${setupMessage.selectedMenuItem}`);
-      this._setApplicationLauncherMenuItem(this._selectedAppMenuItem, setupMessage.selectedMenuItem);
-    }
-
-    // "Subscribe using..."
-    this._setSubscribeUsingLabel();
-
-    // "Always use..." checkbox initial state
-    this._setCheckboxCheckedState(setupMessage.reader.alwaysUse);
-    this._setAlwaysUseLabel();
-
-    // We update the "Always use.." checkbox label whenever the selected item
-    // in the list is changed
-    this._handlersList.addEventListener("change", this);
-
-    // Set up the "Subscribe Now" button
-    this._document.getElementById("subscribeButton")
-        .addEventListener("click", this);
-
-    // first-run ui
-    if (setupMessage.showFirstRunUI) {
-      let textfeedinfo1, textfeedinfo2;
-      switch (feedType) {
-        case Ci.nsIFeed.TYPE_VIDEO:
-          textfeedinfo1 = "feedSubscriptionVideoPodcast1";
-          textfeedinfo2 = "feedSubscriptionVideoPodcast2";
-          break;
-        case Ci.nsIFeed.TYPE_AUDIO:
-          textfeedinfo1 = "feedSubscriptionAudioPodcast1";
-          textfeedinfo2 = "feedSubscriptionAudioPodcast2";
-          break;
-        default:
-          textfeedinfo1 = "feedSubscriptionFeed1";
-          textfeedinfo2 = "feedSubscriptionFeed2";
-      }
-
-      let feedinfo1 = this._document.getElementById("feedSubscriptionInfo1");
-      let feedinfo1Str = this._getString(textfeedinfo1);
-      let feedinfo2 = this._document.getElementById("feedSubscriptionInfo2");
-      let feedinfo2Str = this._getString(textfeedinfo2);
-
-      feedinfo1.textContent = feedinfo1Str;
-      feedinfo2.textContent = feedinfo2Str;
-
-      header.setAttribute('firstrun', 'true');
-
-      this._mm.sendAsyncMessage("FeedWriter:ShownFirstRun");
-    }
-  },
-
-  /**
-   * Returns the original URI object of the feed and ensures that this
-   * component is only ever invoked from the preview document.
-   * @param aWindow
-   *        The window of the document invoking the BrowserFeedWriter
-   */
-  _getOriginalURI(aWindow) {
-    let docShell = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
-                          .getInterface(Ci.nsIWebNavigation)
-                          .QueryInterface(Ci.nsIDocShell);
-    let chan = docShell.currentDocumentChannel;
-
-    // We probably need to call InheritFromDocShellToDoc for this, but right now
-    // we can't call it from JS.
-    let attrs = docShell.getOriginAttributes();
-    let ssm = Services.scriptSecurityManager;
-    let nullPrincipal = ssm.createNullPrincipal(attrs);
-
-    // this channel is not going to be openend, use a nullPrincipal
-    // and the most restrctive securityFlag.
-    let resolvedURI = NetUtil.newChannel({
-      uri: "about:feeds",
-      loadingPrincipal: nullPrincipal,
-      securityFlags: Ci.nsILoadInfo.SEC_REQUIRE_SAME_ORIGIN_DATA_IS_BLOCKED,
-      contentPolicyType: Ci.nsIContentPolicy.TYPE_OTHER
-    }).URI;
-
-    if (resolvedURI.equals(chan.URI))
-      return chan.originalURI;
-
-    return null;
-  },
-
-  _window: null,
-  _document: null,
-  _feedURI: null,
-  _feedPrincipal: null,
-  _handlersList: null,
-
-  // BrowserFeedWriter WebIDL methods
-  init(aWindow) {
-    let window = aWindow;
-    this._feedURI = this._getOriginalURI(window);
-    if (!this._feedURI)
-      return;
-
-    this._window = window;
-    this._document = window.document;
-    this._handlersList = this._document.getElementById("handlersMenuList");
-
-    let secman = Cc["@mozilla.org/scriptsecuritymanager;1"].
-                 getService(Ci.nsIScriptSecurityManager);
-    this._feedPrincipal = secman.createCodebasePrincipal(this._feedURI, {});
-
-    LOG("Subscribe Preview: feed uri = " + this._window.location.href);
-
-
-    this._mm.addMessageListener("FeedWriter:PreferenceUpdated", this);
-    this._mm.addMessageListener("FeedWriter:SetApplicationLauncherMenuItem", this);
-    this._mm.addMessageListener("FeedWriter:GetSubscriptionUIResponse", this);
-    this._mm.addMessageListener("FeedWriter:SetFeedPrefsAndSubscribeResponse", this);
-
-    const feedType = this._getFeedType();
-    this._mm.sendAsyncMessage("FeedWriter:GetSubscriptionUI",
-                              { feedType });
-  },
-
-  receiveMessage(msg) {
-    if (!this._window) {
-      // this._window is null unless this.init was called with a trusted
-      // window object.
-      return;
-    }
-    LOG(`received message from parent ${msg.name}`);
-    switch (msg.name) {
-      case "FeedWriter:PreferenceUpdated":
-        // This is called when browser-feeds.js spots a pref change
-        // This will happen when
-        // - about:preferences#applications changes
-        // - another feed reader page changes the preference
-        // - when this page itself changes the select and there isn't a redirect
-        //   bookmarks and launching an external app means the page stays open after subscribe
-        const feedType = this._getFeedType();
-        LOG(`Got prefChange! ${JSON.stringify(msg.data)} current type: ${feedType}`);
-        let feedTypePref = msg.data.default;
-        if (feedType in msg.data) {
-          feedTypePref = msg.data[feedType];
-        }
-        LOG(`Got pref ${JSON.stringify(feedTypePref)}`);
-        this._setCheckboxCheckedState(feedTypePref.alwaysUse);
-        this._setSelectedHandlerResponse(feedTypePref.handler, feedTypePref.url);
-        this._setAlwaysUseLabel();
-        break;
-      case "FeedWriter:SetFeedPrefsAndSubscribeResponse":
-        LOG(`FeedWriter:SetFeedPrefsAndSubscribeResponse - Redirecting ${msg.data.redirect}`);
-        this._window.location.href = msg.data.redirect;
-        break;
-      case "FeedWriter:GetSubscriptionUIResponse":
-        // Set up the subscription UI
-        this._initSubscriptionUI(msg.data);
-        break;
-      case "FeedWriter:SetApplicationLauncherMenuItem":
-        LOG(`FeedWriter:SetApplicationLauncherMenuItem - picked ${msg.data.name}`);
-        this._setApplicationLauncherMenuItem(this._selectedAppMenuItem, msg.data.name);
-        // Potentially a bit racy, but I don't think we can get into a state where this callback is set and
-        // we're not coming back from ChooseClientApp in browser-feeds.js
-        if (this._subscribeCallback) {
-          this._subscribeCallback();
-          this._subscribeCallback = null;
-        }
-        break;
-    }
-  },
-
-  _setApplicationLauncherMenuItem(menuItem, aName) {
-    /* unselect all handlers */
-    [...this._handlersList.children].forEach((option) => {
-      option.removeAttribute("selected");
-    });
-    menuItem.textContent = aName;
-    menuItem.style.display = "";
-    menuItem.selected = true;
-  },
-
-  writeContent() {
-    if (!this._window)
-      return;
-
-    try {
-      // Set up the feed content
-      let container = this._getContainer();
-      if (!container)
-        return;
-
-      this._setTitleText(container);
-      this._setTitleImage(container);
-      this._writeFeedContent(container);
-    }
-    finally {
-      this._removeFeedFromCache();
-    }
-  },
-
-  close() {
-    this._document.getElementById("subscribeButton")
-        .removeEventListener("click", this, false);
-    this._handlersList
-        .removeEventListener("change", this, false);
-    this._document = null;
-    this._window = null;
-    this._handlersList = null;
-
-    this._removeFeedFromCache();
-    this.__bundle = null;
-    this._feedURI = null;
-
-    this._selectedApp = undefined;
-    this._selectedAppMenuItem = null;
-    this._defaultHandlerMenuItem = null;
-  },
-
-  _removeFeedFromCache() {
-    if (this._feedURI) {
-      let feedService = Cc["@mozilla.org/browser/feeds/result-service;1"].
-                        getService(Ci.nsIFeedResultService);
-      feedService.removeFeedResult(this._feedURI);
-      this._feedURI = null;
-    }
-  },
-
-  subscribe() {
-    let feedType = this._getFeedType();
-
-    // Subscribe to the feed using the selected handler and save prefs
-    let defaultHandler = "reader";
-    let useAsDefault = this._document.getElementById("alwaysUse").getAttribute("checked");
-
-    let selectedItem = this._handlersList.selectedOptions[0];
-    let subscribeCallback = () => {
-      let feedReader = null;
-      let settings = {
-        feedType,
-        useAsDefault,
-        // Pull the title and subtitle out of the document
-        feedTitle: this._document.getElementById(TITLE_ID).textContent,
-        feedSubtitle: this._document.getElementById(SUBTITLE_ID).textContent,
-        feedLocation: this._window.location.href
-      };
-      if (selectedItem.hasAttribute("webhandlerurl")) {
-        feedReader = "web";
-        settings.uri = selectedItem.getAttribute("webhandlerurl");
-      } else {
-        switch (selectedItem.id) {
-          case "selectedAppMenuItem":
-            feedReader = "client";
-            break;
-          case "defaultHandlerMenuItem":
-            feedReader = "default";
-            break;
-          case "liveBookmarksMenuItem":
-            defaultHandler = "bookmarks";
-            feedReader = "bookmarks";
-            break;
-        }
-      }
-      settings.reader = feedReader;
-
-      // If "Always use..." is checked, we should set PREF_*SELECTED_ACTION
-      // to either "reader" (If a web reader or if an application is selected),
-      // or to "bookmarks" (if the live bookmarks option is selected).
-      // Otherwise, we should set it to "ask"
-      if (!useAsDefault) {
-        defaultHandler = "ask";
-      }
-      settings.action = defaultHandler;
-      LOG(`FeedWriter:SetFeedPrefsAndSubscribe - ${JSON.stringify(settings)}`);
-      this._mm.sendAsyncMessage("FeedWriter:SetFeedPrefsAndSubscribe",
-                                settings);
-    }
-
-    // Show the file picker before subscribing if the
-    // choose application menuitem was chosen using the keyboard
-    if (selectedItem.id == "chooseApplicationMenuItem") {
-      this._chooseClientApp(function(aResult) {
-        if (aResult) {
-          selectedItem =
-            this._handlersList.selectedOptions[0];
-          subscribeCallback();
-        }
-      }.bind(this));
-    } else {
-      subscribeCallback();
-    }
-  },
-
-  get _mm() {
-    let mm = this._window.QueryInterface(Ci.nsIInterfaceRequestor).
-                          getInterface(Ci.nsIDocShell).
-                          QueryInterface(Ci.nsIInterfaceRequestor).
-                          getInterface(Ci.nsIContentFrameMessageManager);
-    delete this._mm;
-    return this._mm = mm;
-  },
-
-  classID: FEEDWRITER_CID,
-  QueryInterface: XPCOMUtils.generateQI([Ci.nsIDOMEventListener, Ci.nsIObserver,
-                                         Ci.nsINavHistoryObserver,
-                                         Ci.nsIDOMGlobalPropertyInitializer])
-};
-
-this.NSGetFactory = XPCOMUtils.generateNSGetFactory([FeedWriter]);
diff --git a/browser/components/feeds/WebContentConverter.js b/browser/components/feeds/WebContentConverter.js
deleted file mode 100644
index 2cb5cd145..000000000
--- a/browser/components/feeds/WebContentConverter.js
+++ /dev/null
@@ -1,1071 +0,0 @@
-/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-Components.utils.import("resource://gre/modules/Services.jsm");
-Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
-Components.utils.import("resource://gre/modules/PrivateBrowsingUtils.jsm");
-
-const Cc = Components.classes;
-const Ci = Components.interfaces;
-const Cr = Components.results;
-
-function LOG(str) {
-  dump("*** " + str + "\n");
-}
-
-const WCCR_CONTRACTID = "@mozilla.org/embeddor.implemented/web-content-handler-registrar;1";
-const WCCR_CLASSID = Components.ID("{792a7e82-06a0-437c-af63-b2d12e808acc}");
-
-const WCC_CLASSID = Components.ID("{db7ebf28-cc40-415f-8a51-1b111851df1e}");
-const WCC_CLASSNAME = "Web Service Handler";
-
-const TYPE_MAYBE_FEED = "application/vnd.mozilla.maybe.feed";
-const TYPE_ANY = "*/*";
-
-const PREF_CONTENTHANDLERS_AUTO = "browser.contentHandlers.auto.";
-const PREF_CONTENTHANDLERS_BRANCH = "browser.contentHandlers.types.";
-const PREF_SELECTED_WEB = "browser.feeds.handlers.webservice";
-const PREF_SELECTED_ACTION = "browser.feeds.handler";
-const PREF_SELECTED_READER = "browser.feeds.handler.default";
-const PREF_HANDLER_EXTERNAL_PREFIX = "network.protocol-handler.external";
-const PREF_ALLOW_DIFFERENT_HOST = "gecko.handlerService.allowRegisterFromDifferentHost";
-
-const STRING_BUNDLE_URI = "chrome://browser/locale/feeds/subscribe.properties";
-
-const NS_ERROR_MODULE_DOM = 2152923136;
-const NS_ERROR_DOM_SYNTAX_ERR = NS_ERROR_MODULE_DOM + 12;
-
-function WebContentConverter() {
-}
-WebContentConverter.prototype = {
-  convert() { },
-  asyncConvertData() { },
-  onDataAvailable() { },
-  onStopRequest() { },
-
-  onStartRequest(request, context) {
-    let wccr =
-        Cc[WCCR_CONTRACTID].
-        getService(Ci.nsIWebContentConverterService);
-    wccr.loadPreferredHandler(request);
-  },
-
-  QueryInterface(iid) {
-    if (iid.equals(Ci.nsIStreamConverter) ||
-        iid.equals(Ci.nsIStreamListener) ||
-        iid.equals(Ci.nsISupports))
-      return this;
-    throw Cr.NS_ERROR_NO_INTERFACE;
-  }
-};
-
-let WebContentConverterFactory = {
-  createInstance(outer, iid) {
-    if (outer != null)
-      throw Cr.NS_ERROR_NO_AGGREGATION;
-    return new WebContentConverter().QueryInterface(iid);
-  },
-
-  QueryInterface(iid) {
-    if (iid.equals(Ci.nsIFactory) ||
-        iid.equals(Ci.nsISupports))
-      return this;
-    throw Cr.NS_ERROR_NO_INTERFACE;
-  }
-};
-
-function ServiceInfo(contentType, uri, name) {
-  this._contentType = contentType;
-  this._uri = uri;
-  this._name = name;
-}
-ServiceInfo.prototype = {
-  /**
-   * See nsIHandlerApp
-   */
-  get name() {
-    return this._name;
-  },
-
-  /**
-   * See nsIHandlerApp
-   */
-  equals(aHandlerApp) {
-    if (!aHandlerApp)
-      throw Cr.NS_ERROR_NULL_POINTER;
-
-    if (aHandlerApp instanceof Ci.nsIWebContentHandlerInfo &&
-        aHandlerApp.contentType == this.contentType &&
-        aHandlerApp.uri == this.uri)
-      return true;
-
-    return false;
-  },
-
-  /**
-   * See nsIWebContentHandlerInfo
-   */
-  get contentType() {
-    return this._contentType;
-  },
-
-  /**
-   * See nsIWebContentHandlerInfo
-   */
-  get uri() {
-    return this._uri;
-  },
-
-  /**
-   * See nsIWebContentHandlerInfo
-   */
-  getHandlerURI(uri) {
-    return this._uri.replace(/%s/gi, encodeURIComponent(uri));
-  },
-
-  QueryInterface(iid) {
-    if (iid.equals(Ci.nsIWebContentHandlerInfo) ||
-        iid.equals(Ci.nsISupports))
-      return this;
-    throw Cr.NS_ERROR_NO_INTERFACE;
-  }
-};
-
-const Utils = {
-  makeURI(aURL, aOriginCharset, aBaseURI) {
-    return Services.io.newURI(aURL, aOriginCharset, aBaseURI);
-  },
-
-  checkAndGetURI(aURIString, aContentWindow) {
-    let uri;
-    try {
-      let baseURI = aContentWindow.document.baseURIObject;
-      uri = this.makeURI(aURIString, null, baseURI);
-    } catch (ex) {
-      throw NS_ERROR_DOM_SYNTAX_ERR;
-    }
-
-    // For security reasons we reject non-http(s) urls (see bug 354316),
-    // we may need to revise this once we support more content types
-    if (uri.scheme != "http" && uri.scheme != "https") {
-      throw this.getSecurityError(
-        "Permission denied to add " + uri.spec + " as a content or protocol handler",
-        aContentWindow);
-    }
-
-    // We also reject handlers registered from a different host (see bug 402287)
-    // The pref allows us to test the feature
-    let pb = Services.prefs;
-    if (!pb.getBoolPref(PREF_ALLOW_DIFFERENT_HOST) &&
-        (!["http:", "https:"].includes(aContentWindow.location.protocol) ||
-         aContentWindow.location.hostname != uri.host)) {
-      throw this.getSecurityError(
-        "Permission denied to add " + uri.spec + " as a content or protocol handler",
-        aContentWindow);
-    }
-
-    // If the uri doesn't contain '%s', it won't be a good handler
-    if (uri.spec.indexOf("%s") < 0)
-      throw NS_ERROR_DOM_SYNTAX_ERR;
-
-    return uri;
-  },
-
-  // NB: Throws if aProtocol is not allowed.
-  checkProtocolHandlerAllowed(aProtocol, aURIString, aWindowOrNull) {
-    // First, check to make sure this isn't already handled internally (we don't
-    // want to let them take over, say "chrome").
-    let handler = Services.io.getProtocolHandler(aProtocol);
-    if (!(handler instanceof Ci.nsIExternalProtocolHandler)) {
-      // This is handled internally, so we don't want them to register
-      throw this.getSecurityError(
-        `Permission denied to add ${aURIString} as a protocol handler`,
-        aWindowOrNull);
-    }
-
-    // check if it is in the black list
-    let pb = Services.prefs;
-    let allowed;
-    try {
-      allowed = pb.getBoolPref(PREF_HANDLER_EXTERNAL_PREFIX + "." + aProtocol);
-    }
-    catch (e) {
-      allowed = pb.getBoolPref(PREF_HANDLER_EXTERNAL_PREFIX + "-default");
-    }
-    if (!allowed) {
-      throw this.getSecurityError(
-        `Not allowed to register a protocol handler for ${aProtocol}`,
-        aWindowOrNull);
-    }
-  },
-
-  // Return a SecurityError exception from the given Window if one is given.  If
-  // none is given, just return the given error string, for lack of anything
-  // better.
-  getSecurityError(errorString, aWindowOrNull) {
-    if (!aWindowOrNull) {
-      return errorString;
-    }
-
-    return new aWindowOrNull.DOMException(errorString, "SecurityError");
-  },
-
-  /**
-   * Mappings from known feed types to our internal content type.
-   */
-  _mappings: {
-    "application/rss+xml": TYPE_MAYBE_FEED,
-    "application/atom+xml": TYPE_MAYBE_FEED,
-  },
-
-  resolveContentType(aContentType) {
-    if (aContentType in this._mappings)
-      return this._mappings[aContentType];
-    return aContentType;
-  }
-};
-
-function WebContentConverterRegistrar() {
-  this._contentTypes = {};
-  this._autoHandleContentTypes = {};
-}
-
-WebContentConverterRegistrar.prototype = {
-  get stringBundle() {
-    let sb = Services.strings.createBundle(STRING_BUNDLE_URI);
-    delete WebContentConverterRegistrar.prototype.stringBundle;
-    return WebContentConverterRegistrar.prototype.stringBundle = sb;
-  },
-
-  _getFormattedString(key, params) {
-    return this.stringBundle.formatStringFromName(key, params, params.length);
-  },
-
-  _getString(key) {
-    return this.stringBundle.GetStringFromName(key);
-  },
-
-  /**
-   * See nsIWebContentConverterService
-   */
-  getAutoHandler(contentType) {
-    contentType = Utils.resolveContentType(contentType);
-    if (contentType in this._autoHandleContentTypes)
-      return this._autoHandleContentTypes[contentType];
-    return null;
-  },
-
-  /**
-   * See nsIWebContentConverterService
-   */
-  setAutoHandler(contentType, handler) {
-    if (handler && !this._typeIsRegistered(contentType, handler.uri))
-      throw Cr.NS_ERROR_NOT_AVAILABLE;
-
-    contentType = Utils.resolveContentType(contentType);
-    this._setAutoHandler(contentType, handler);
-
-    let ps = Services.prefs;
-    let autoBranch = ps.getBranch(PREF_CONTENTHANDLERS_AUTO);
-    if (handler)
-      autoBranch.setCharPref(contentType, handler.uri);
-    else if (autoBranch.prefHasUserValue(contentType))
-      autoBranch.clearUserPref(contentType);
-
-    ps.savePrefFile(null);
-  },
-
-  /**
-   * Update the internal data structure (not persistent)
-   */
-  _setAutoHandler(contentType, handler) {
-    if (handler)
-      this._autoHandleContentTypes[contentType] = handler;
-    else if (contentType in this._autoHandleContentTypes)
-      delete this._autoHandleContentTypes[contentType];
-  },
-
-  /**
-   * See nsIWebContentConverterService
-   */
-  getWebContentHandlerByURI(contentType, uri) {
-    return this.getContentHandlers(contentType)
-               .find(e => e.uri == uri) || null;
-  },
-
-  /**
-   * See nsIWebContentConverterService
-   */
-  loadPreferredHandler(request) {
-    let channel = request.QueryInterface(Ci.nsIChannel);
-    let contentType = Utils.resolveContentType(channel.contentType);
-    let handler = this.getAutoHandler(contentType);
-    if (handler) {
-      request.cancel(Cr.NS_ERROR_FAILURE);
-
-      let webNavigation =
-          channel.notificationCallbacks.getInterface(Ci.nsIWebNavigation);
-      webNavigation.loadURI(handler.getHandlerURI(channel.URI.spec),
-                            Ci.nsIWebNavigation.LOAD_FLAGS_NONE,
-                            null, null, null);
-    }
-  },
-
-  /**
-   * See nsIWebContentConverterService
-   */
-  removeProtocolHandler(aProtocol, aURITemplate) {
-    let eps = Cc["@mozilla.org/uriloader/external-protocol-service;1"].
-              getService(Ci.nsIExternalProtocolService);
-    let handlerInfo = eps.getProtocolHandlerInfo(aProtocol);
-    let handlers =  handlerInfo.possibleApplicationHandlers;
-    for (let i = 0; i < handlers.length; i++) {
-      try { // We only want to test web handlers
-        let handler = handlers.queryElementAt(i, Ci.nsIWebHandlerApp);
-        if (handler.uriTemplate == aURITemplate) {
-          handlers.removeElementAt(i);
-          let hs = Cc["@mozilla.org/uriloader/handler-service;1"].
-                   getService(Ci.nsIHandlerService);
-          hs.store(handlerInfo);
-          return;
-        }
-      } catch (e) { /* it wasn't a web handler */ }
-    }
-  },
-
-  /**
-   * See nsIWebContentConverterService
-   */
-  removeContentHandler(contentType, uri) {
-    function notURI(serviceInfo) {
-      return serviceInfo.uri != uri;
-    }
-
-    if (contentType in this._contentTypes) {
-      this._contentTypes[contentType] =
-        this._contentTypes[contentType].filter(notURI);
-    }
-  },
-
-  /**
-   * These are types for which there is a separate content converter aside
-   * from our built in generic one. We should not automatically register
-   * a factory for creating a converter for these types.
-   */
-  _blockedTypes: {
-    "application/vnd.mozilla.maybe.feed": true,
-  },
-
-  /**
-   * Determines if a web handler is already registered.
-   *
-   * @param aProtocol
-   *        The scheme of the web handler we are checking for.
-   * @param aURITemplate
-   *        The URI template that the handler uses to handle the protocol.
-   * @return true if it is already registered, false otherwise.
-   */
-  _protocolHandlerRegistered(aProtocol, aURITemplate) {
-    let eps = Cc["@mozilla.org/uriloader/external-protocol-service;1"].
-              getService(Ci.nsIExternalProtocolService);
-    let handlerInfo = eps.getProtocolHandlerInfo(aProtocol);
-    let handlers =  handlerInfo.possibleApplicationHandlers;
-    for (let i = 0; i < handlers.length; i++) {
-      try { // We only want to test web handlers
-        let handler = handlers.queryElementAt(i, Ci.nsIWebHandlerApp);
-        if (handler.uriTemplate == aURITemplate)
-          return true;
-      } catch (e) { /* it wasn't a web handler */ }
-    }
-    return false;
-  },
-
-  /**
-   * See nsIWebContentHandlerRegistrar
-   */
-  registerProtocolHandler(aProtocol, aURIString, aTitle, aBrowserOrWindow) {
-    LOG("registerProtocolHandler(" + aProtocol + "," + aURIString + "," + aTitle + ")");
-    let haveWindow = (aBrowserOrWindow instanceof Ci.nsIDOMWindow);
-    let uri;
-    if (haveWindow) {
-      uri = Utils.checkAndGetURI(aURIString, aBrowserOrWindow);
-    } else {
-      // aURIString must not be a relative URI.
-      uri = Utils.makeURI(aURIString, null);
-    }
-
-    // If the protocol handler is already registered, just return early.
-    if (this._protocolHandlerRegistered(aProtocol, uri.spec)) {
-      return;
-    }
-
-    let browser;
-    if (haveWindow) {
-      let browserWindow =
-        this._getBrowserWindowForContentWindow(aBrowserOrWindow);
-      browser = this._getBrowserForContentWindow(browserWindow,
-                                                 aBrowserOrWindow);
-    } else {
-      browser = aBrowserOrWindow;
-    }
-    if (PrivateBrowsingUtils.isBrowserPrivate(browser)) {
-      // Inside the private browsing mode, we don't want to alert the user to save
-      // a protocol handler.  We log it to the error console so that web developers
-      // would have some way to tell what's going wrong.
-      Services.console.
-      logStringMessage("Web page denied access to register a protocol handler inside private browsing mode");
-      return;
-    }
-
-    Utils.checkProtocolHandlerAllowed(aProtocol, aURIString,
-                                      haveWindow ? aBrowserOrWindow : null);
-
-    // Now Ask the user and provide the proper callback
-    let message = this._getFormattedString("addProtocolHandler",
-                                           [aTitle, uri.host, aProtocol]);
-
-    let notificationIcon = uri.prePath + "/favicon.ico";
-    let notificationValue = "Protocol Registration: " + aProtocol;
-    let addButton = {
-      label: this._getString("addProtocolHandlerAddButton"),
-      accessKey: this._getString("addProtocolHandlerAddButtonAccesskey"),
-      protocolInfo: { protocol: aProtocol, uri: uri.spec, name: aTitle },
-
-      callback(aNotification, aButtonInfo) {
-          let protocol = aButtonInfo.protocolInfo.protocol;
-          let uri      = aButtonInfo.protocolInfo.uri;
-          let name     = aButtonInfo.protocolInfo.name;
-
-          let handler = Cc["@mozilla.org/uriloader/web-handler-app;1"].
-                        createInstance(Ci.nsIWebHandlerApp);
-          handler.name = name;
-          handler.uriTemplate = uri;
-
-          let eps = Cc["@mozilla.org/uriloader/external-protocol-service;1"].
-                    getService(Ci.nsIExternalProtocolService);
-          let handlerInfo = eps.getProtocolHandlerInfo(protocol);
-          handlerInfo.possibleApplicationHandlers.appendElement(handler, false);
-
-          // Since the user has agreed to add a new handler, chances are good
-          // that the next time they see a handler of this type, they're going
-          // to want to use it.  Reset the handlerInfo to ask before the next
-          // use.
-          handlerInfo.alwaysAskBeforeHandling = true;
-
-          let hs = Cc["@mozilla.org/uriloader/handler-service;1"].
-                   getService(Ci.nsIHandlerService);
-          hs.store(handlerInfo);
-        }
-    };
-    let notificationBox = browser.getTabBrowser().getNotificationBox(browser);
-    notificationBox.appendNotification(message,
-                                       notificationValue,
-                                       notificationIcon,
-                                       notificationBox.PRIORITY_INFO_LOW,
-                                       [addButton]);
-  },
-
-  /**
-   * See nsIWebContentHandlerRegistrar
-   * If a DOM window is provided, then the request came from content, so we
-   * prompt the user to confirm the registration.
-   */
-  registerContentHandler(aContentType, aURIString, aTitle, aWindowOrBrowser) {
-    LOG("registerContentHandler(" + aContentType + "," + aURIString + "," + aTitle + ")");
-
-    // Make sure to do our URL checks up front, before our content type check,
-    // just like the WebContentConverterRegistrarContent does.
-    let haveWindow = aWindowOrBrowser &&
-                     (aWindowOrBrowser instanceof Ci.nsIDOMWindow);
-    let uri;
-    if (haveWindow) {
-      uri = Utils.checkAndGetURI(aURIString, aWindowOrBrowser);
-    } else if (aWindowOrBrowser) {
-      // uri was vetted in the content process.
-      uri = Utils.makeURI(aURIString, null);
-    }
-
-    // We only support feed types at present.
-    let contentType = Utils.resolveContentType(aContentType);
-    // XXX We should be throwing a Utils.getSecurityError() here in at least
-    // some cases.  See bug 1266492.
-    if (contentType != TYPE_MAYBE_FEED) {
-      return;
-    }
-
-    if (aWindowOrBrowser) {
-      let notificationBox;
-      if (haveWindow) {
-        let browserWindow = this._getBrowserWindowForContentWindow(aWindowOrBrowser);
-        let browserElement = this._getBrowserForContentWindow(browserWindow, aWindowOrBrowser);
-        notificationBox = browserElement.getTabBrowser().getNotificationBox(browserElement);
-      } else {
-        notificationBox = aWindowOrBrowser.getTabBrowser()
-                                          .getNotificationBox(aWindowOrBrowser);
-      }
-
-      this._appendFeedReaderNotification(uri, aTitle, notificationBox);
-    }
-    else {
-      this._registerContentHandler(contentType, aURIString, aTitle);
-    }
-  },
-
-  /**
-   * Returns the browser chrome window in which the content window is in
-   */
-  _getBrowserWindowForContentWindow(aContentWindow) {
-    return aContentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
-                         .getInterface(Ci.nsIWebNavigation)
-                         .QueryInterface(Ci.nsIDocShellTreeItem)
-                         .rootTreeItem
-                         .QueryInterface(Ci.nsIInterfaceRequestor)
-                         .getInterface(Ci.nsIDOMWindow)
-                         .wrappedJSObject;
-  },
-
-  /**
-   * Returns the <xul:browser> element associated with the given content
-   * window.
-   *
-   * @param aBrowserWindow
-   *        The browser window in which the content window is in.
-   * @param aContentWindow
-   *        The content window. It's possible to pass a child content window
-   *        (i.e. the content window of a frame/iframe).
-   */
-  _getBrowserForContentWindow(aBrowserWindow, aContentWindow) {
-    // This depends on pseudo APIs of browser.js and tabbrowser.xml
-    aContentWindow = aContentWindow.top;
-    return aBrowserWindow.gBrowser.browsers.find((browser) =>
-      browser.contentWindow == aContentWindow);
-  },
-
-  /**
-   * Appends a notifcation for the given feed reader details.
-   *
-   * The notification could be either a pseudo-dialog which lets
-   * the user to add the feed reader:
-   * [ [icon] Add %feed-reader-name% (%feed-reader-host%) as a Feed Reader?  (Add) [x] ]
-   *
-   * or a simple message for the case where the feed reader is already registered:
-   * [ [icon] %feed-reader-name% is already registered as a Feed Reader             [x] ]
-   *
-   * A new notification isn't appended if the given notificationbox has a
-   * notification for the same feed reader.
-   *
-   * @param aURI
-   *        The url of the feed reader as a nsIURI object
-   * @param aName
-   *        The feed reader name as it was passed to registerContentHandler
-   * @param aNotificationBox
-   *        The notification box to which a notification might be appended
-   * @return true if a notification has been appended, false otherwise.
-   */
-  _appendFeedReaderNotification(aURI, aName, aNotificationBox) {
-    let uriSpec = aURI.spec;
-    let notificationValue = "feed reader notification: " + uriSpec;
-    let notificationIcon = aURI.prePath + "/favicon.ico";
-
-    // Don't append a new notification if the notificationbox
-    // has a notification for the given feed reader already
-    if (aNotificationBox.getNotificationWithValue(notificationValue))
-      return false;
-
-    let buttons;
-    let message;
-    if (this.getWebContentHandlerByURI(TYPE_MAYBE_FEED, uriSpec))
-      message = this._getFormattedString("handlerRegistered", [aName]);
-    else {
-      message = this._getFormattedString("addHandler", [aName, aURI.host]);
-      let self = this;
-      let addButton = {
-        _outer: self,
-        label: self._getString("addHandlerAddButton"),
-        accessKey: self._getString("addHandlerAddButtonAccesskey"),
-        feedReaderInfo: { uri: uriSpec, name: aName },
-
-        /* static */
-        callback(aNotification, aButtonInfo) {
-          let uri = aButtonInfo.feedReaderInfo.uri;
-          let name = aButtonInfo.feedReaderInfo.name;
-          let outer = aButtonInfo._outer;
-
-          // The reader could have been added from another window mean while
-          if (!outer.getWebContentHandlerByURI(TYPE_MAYBE_FEED, uri))
-            outer._registerContentHandler(TYPE_MAYBE_FEED, uri, name);
-
-          // avoid reference cycles
-          aButtonInfo._outer = null;
-
-          return false;
-        }
-      };
-      buttons = [addButton];
-    }
-
-    aNotificationBox.appendNotification(message,
-                                        notificationValue,
-                                        notificationIcon,
-                                        aNotificationBox.PRIORITY_INFO_LOW,
-                                        buttons);
-    return true;
-  },
-
-  /**
-   * Save Web Content Handler metadata to persistent preferences.
-   * @param   contentType
-   *          The content Type being handled
-   * @param   uri
-   *          The uri of the web service
-   * @param   title
-   *          The human readable name of the web service
-   *
-   * This data is stored under:
-   *
-   *    browser.contentHandlers.type0 = content/type
-   *    browser.contentHandlers.uri0 = http://www.foo.com/q=%s
-   *    browser.contentHandlers.title0 = Foo 2.0alphr
-   */
-  _saveContentHandlerToPrefs(contentType, uri, title) {
-    let ps = Services.prefs;
-    let i = 0;
-    let typeBranch = null;
-    while (true) {
-      typeBranch =
-        ps.getBranch(PREF_CONTENTHANDLERS_BRANCH + i + ".");
-      try {
-        typeBranch.getCharPref("type");
-        ++i;
-      }
-      catch (e) {
-        // No more handlers
-        break;
-      }
-    }
-    if (typeBranch) {
-      typeBranch.setCharPref("type", contentType);
-      let pls =
-          Cc["@mozilla.org/pref-localizedstring;1"].
-          createInstance(Ci.nsIPrefLocalizedString);
-      pls.data = uri;
-      typeBranch.setComplexValue("uri", Ci.nsIPrefLocalizedString, pls);
-      pls.data = title;
-      typeBranch.setComplexValue("title", Ci.nsIPrefLocalizedString, pls);
-
-      ps.savePrefFile(null);
-    }
-  },
-
-  /**
-   * Determines if there is a type with a particular uri registered for the
-   * specified content type already.
-   * @param   contentType
-   *          The content type that the uri handles
-   * @param   uri
-   *          The uri of the content type
-   */
-  _typeIsRegistered(contentType, uri) {
-    if (!(contentType in this._contentTypes))
-      return false;
-
-    return this._contentTypes[contentType]
-               .some(t => t.uri == uri);
-  },
-
-  /**
-   * Gets a stream converter contract id for the specified content type.
-   * @param   contentType
-   *          The source content type for the conversion.
-   * @returns A contract id to construct a converter to convert between the
-   *          contentType and *\/*.
-   */
-  _getConverterContractID(contentType) {
-    const template = "@mozilla.org/streamconv;1?from=%s&to=*/*";
-    return template.replace(/%s/, contentType);
-  },
-
-  /**
-   * Register a web service handler for a content type.
-   *
-   * @param   contentType
-   *          the content type being handled
-   * @param   uri
-   *          the URI of the web service
-   * @param   title
-   *          the human readable name of the web service
-   */
-  _registerContentHandler(contentType, uri, title) {
-    this._updateContentTypeHandlerMap(contentType, uri, title);
-    this._saveContentHandlerToPrefs(contentType, uri, title);
-
-    if (contentType == TYPE_MAYBE_FEED) {
-      // Make the new handler the last-selected reader in the preview page
-      // and make sure the preview page is shown the next time a feed is visited
-      let pb = Services.prefs.getBranch(null);
-      pb.setCharPref(PREF_SELECTED_READER, "web");
-
-      let supportsString =
-        Cc["@mozilla.org/supports-string;1"].
-        createInstance(Ci.nsISupportsString);
-        supportsString.data = uri;
-      pb.setComplexValue(PREF_SELECTED_WEB, Ci.nsISupportsString,
-                         supportsString);
-      pb.setCharPref(PREF_SELECTED_ACTION, "ask");
-      this._setAutoHandler(TYPE_MAYBE_FEED, null);
-    }
-  },
-
-  /**
-   * Update the content type -> handler map. This mapping is not persisted, use
-   * registerContentHandler or _saveContentHandlerToPrefs for that purpose.
-   * @param   contentType
-   *          The content Type being handled
-   * @param   uri
-   *          The uri of the web service
-   * @param   title
-   *          The human readable name of the web service
-   */
-  _updateContentTypeHandlerMap(contentType, uri, title) {
-    if (!(contentType in this._contentTypes))
-      this._contentTypes[contentType] = [];
-
-    // Avoid adding duplicates
-    if (this._typeIsRegistered(contentType, uri))
-      return;
-
-    this._contentTypes[contentType].push(new ServiceInfo(contentType, uri, title));
-
-    if (!(contentType in this._blockedTypes)) {
-      let converterContractID = this._getConverterContractID(contentType);
-      let cr = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
-      cr.registerFactory(WCC_CLASSID, WCC_CLASSNAME, converterContractID,
-                         WebContentConverterFactory);
-    }
-  },
-
-  /**
-   * See nsIWebContentConverterService
-   */
-  getContentHandlers(contentType, countRef) {
-    if (countRef) {
-      countRef.value = 0;
-    }
-    if (!(contentType in this._contentTypes))
-      return [];
-
-    let handlers = this._contentTypes[contentType];
-    if (countRef) {
-      countRef.value = handlers.length;
-    }
-    return handlers;
-  },
-
-  /**
-   * See nsIWebContentConverterService
-   */
-  resetHandlersForType(contentType) {
-    // currently unused within the tree, so only useful for extensions; previous
-    // impl. was buggy (and even infinite-looped!), so I argue that this is a
-    // definite improvement
-    throw Cr.NS_ERROR_NOT_IMPLEMENTED;
-  },
-
-  /**
-   * Registers a handler from the settings on a preferences branch.
-   *
-   * Since we support up to six predefined readers, we need to handle gaps
-   * better, since the first branch with user-added values will be .6
-   *
-   * How we deal with that is to check to see if there's no prefs in the
-   * branch and stop cycling once that's true.  This doesn't fix the case
-   * where a user manually removes a reader, but that's not supported yet!
-   *
-   * @param branch
-   *        an nsIPrefBranch containing "type", "uri", and "title" preferences
-   *        corresponding to the content handler to be registered
-   */
-  _registerContentHandlerHavingBranch(branch) {
-    let vals = branch.getChildList("");
-    if (vals.length == 0)
-      return;
-
-    let type = branch.getCharPref("type");
-    let uri = branch.getComplexValue("uri", Ci.nsIPrefLocalizedString).data;
-    let title = branch.getComplexValue("title",
-                                       Ci.nsIPrefLocalizedString).data;
-    this._updateContentTypeHandlerMap(type, uri, title);
-  },
-
-  /**
-   * Load the auto handler, content handler and protocol tables from
-   * preferences.
-   */
-  _init() {
-    let ps = Services.prefs;
-
-    let children = ps.getBranch(PREF_CONTENTHANDLERS_BRANCH)
-                     .getChildList("");
-
-    // first get the numbers of the providers by getting all ###.uri prefs
-    let nums = children.map((child) => {
-      let match = /^(\d+)\.uri$/.exec(child);
-      return match ? match[1] : "";
-    }).filter(child => !!child)
-      .sort();
-
-
-    // now register them
-    for (let num of nums) {
-      let branch = ps.getBranch(PREF_CONTENTHANDLERS_BRANCH + num + ".");
-      try {
-        this._registerContentHandlerHavingBranch(branch);
-      } catch (ex) {
-        // do nothing, the next branch might have values
-      }
-    }
-
-    // We need to do this _after_ registering all of the available handlers,
-    // so that getWebContentHandlerByURI can return successfully.
-    let autoBranch;
-    try {
-      autoBranch = ps.getBranch(PREF_CONTENTHANDLERS_AUTO);
-    } catch (e) {
-      // No auto branch yet, that's fine
-      // LOG("WCCR.init: There is no auto branch, benign");
-    }
-
-    if (autoBranch) {
-      for (let type of autoBranch.getChildList("")) {
-        let uri = autoBranch.getCharPref(type);
-        if (uri) {
-          let handler = this.getWebContentHandlerByURI(type, uri);
-          if (handler) {
-            this._setAutoHandler(type, handler);
-          }
-        }
-      }
-    }
-  },
-
-  /**
-   * See nsIObserver
-   */
-  observe(subject, topic, data) {
-    let os = Services.obs;
-    switch (topic) {
-    case "app-startup":
-      os.addObserver(this, "browser-ui-startup-complete", false);
-      break;
-    case "browser-ui-startup-complete":
-      os.removeObserver(this, "browser-ui-startup-complete");
-      this._init();
-      break;
-    }
-  },
-
-  /**
-   * See nsIFactory
-   */
-  createInstance(outer, iid) {
-    if (outer != null)
-      throw Cr.NS_ERROR_NO_AGGREGATION;
-    return this.QueryInterface(iid);
-  },
-
-  classID: WCCR_CLASSID,
-
-  /**
-   * See nsISupports
-   */
-  QueryInterface: XPCOMUtils.generateQI(
-     [Ci.nsIWebContentConverterService,
-      Ci.nsIWebContentHandlerRegistrar,
-      Ci.nsIObserver,
-      Ci.nsIFactory]),
-
-  _xpcom_categories: [{
-    category: "app-startup",
-    service: true
-  }]
-};
-
-function WebContentConverterRegistrarContent() {
-  this._contentTypes = {};
-}
-
-WebContentConverterRegistrarContent.prototype = {
-
-  /**
-   * Load the auto handler, content handler and protocol tables from
-   * preferences.
-   */
-  _init() {
-    let ps = Services.prefs;
-
-    let children = ps.getBranch(PREF_CONTENTHANDLERS_BRANCH)
-                     .getChildList("");
-
-    // first get the numbers of the providers by getting all ###.uri prefs
-    let nums = children.map((child) => {
-      let match = /^(\d+)\.uri$/.exec(child);
-      return match ? match[1] : "";
-    }).filter(child => !!child)
-      .sort();
-
-    // now register them
-    for (num of nums) {
-      let branch = ps.getBranch(PREF_CONTENTHANDLERS_BRANCH + num + ".");
-      try {
-        this._registerContentHandlerHavingBranch(branch);
-      } catch (ex) {
-        // do nothing, the next branch might have values
-      }
-    }
-  },
-
-  _typeIsRegistered(contentType, uri) {
-    return this._contentTypes[contentType]
-               .some(e => e.uri == uri);
-  },
-
-  /**
-   * Since we support up to six predefined readers, we need to handle gaps
-   * better, since the first branch with user-added values will be .6
-   *
-   * How we deal with that is to check to see if there's no prefs in the
-   * branch and stop cycling once that's true.  This doesn't fix the case
-   * where a user manually removes a reader, but that's not supported yet!
-   *
-   * @param   branch
-   *          The pref branch to register the content handler under
-   *
-   */
-  _registerContentHandlerHavingBranch(branch) {
-    let vals = branch.getChildList("");
-    if (vals.length == 0)
-      return;
-
-    let type = branch.getCharPref("type");
-    let uri = branch.getComplexValue("uri", Ci.nsIPrefLocalizedString).data;
-    let title = branch.getComplexValue("title",
-                                       Ci.nsIPrefLocalizedString).data;
-    this._updateContentTypeHandlerMap(type, uri, title);
-  },
-
-  _updateContentTypeHandlerMap(contentType, uri, title) {
-    if (!(contentType in this._contentTypes))
-      this._contentTypes[contentType] = [];
-
-    // Avoid adding duplicates
-    if (this._typeIsRegistered(contentType, uri))
-      return;
-
-    this._contentTypes[contentType].push(new ServiceInfo(contentType, uri, title));
-
-    if (!(contentType in this._blockedTypes)) {
-      let converterContractID = this._getConverterContractID(contentType);
-      let cr = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
-      cr.registerFactory(WCC_CLASSID, WCC_CLASSNAME, converterContractID,
-                         WebContentConverterFactory);
-    }
-  },
-
-  /**
-   * See nsIWebContentConverterService
-   */
-  getContentHandlers(contentType, countRef) {
-    this._init();
-    if (countRef) {
-      countRef.value = 0;
-    }
-
-    if (!(contentType in this._contentTypes))
-      return [];
-
-    let handlers = this._contentTypes[contentType];
-    if (countRef) {
-      countRef.value = handlers.length;
-    }
-    return handlers;
-  },
-
-  setAutoHandler(contentType, handler) {
-    Services.cpmm.sendAsyncMessage("WCCR:setAutoHandler",
-                                   { contentType, handler });
-  },
-
-  getWebContentHandlerByURI(contentType, uri) {
-    return this.getContentHandlers(contentType)
-               .find(e => e.uri == uri) || null;
-  },
-
-  /**
-   * See nsIWebContentHandlerRegistrar
-   */
-  registerContentHandler(aContentType, aURIString, aTitle, aBrowserOrWindow) {
-    // aBrowserOrWindow must be a window.
-    let messageManager = aBrowserOrWindow.QueryInterface(Ci.nsIInterfaceRequestor)
-                                         .getInterface(Ci.nsIWebNavigation)
-                                         .QueryInterface(Ci.nsIDocShell)
-                                         .QueryInterface(Ci.nsIInterfaceRequestor)
-                                         .getInterface(Ci.nsITabChild)
-                                         .messageManager;
-
-    let uri = Utils.checkAndGetURI(aURIString, aBrowserOrWindow);
-    // XXX We should be throwing a Utils.getSecurityError() here in at least
-    // some cases.  See bug 1266492.
-    if (Utils.resolveContentType(aContentType) != TYPE_MAYBE_FEED) {
-      return;
-    }
-
-    messageManager.sendAsyncMessage("WCCR:registerContentHandler",
-                                    { contentType: aContentType,
-                                      uri: uri.spec,
-                                      title: aTitle });
-  },
-
-  registerProtocolHandler(aProtocol, aURIString, aTitle, aBrowserOrWindow) {
-    // aBrowserOrWindow must be a window.
-    let messageManager = aBrowserOrWindow.QueryInterface(Ci.nsIInterfaceRequestor)
-                                         .getInterface(Ci.nsIWebNavigation)
-                                         .QueryInterface(Ci.nsIDocShell)
-                                         .QueryInterface(Ci.nsIInterfaceRequestor)
-                                         .getInterface(Ci.nsITabChild)
-                                         .messageManager;
-
-    let uri = Utils.checkAndGetURI(aURIString, aBrowserOrWindow);
-    Utils.checkProtocolHandlerAllowed(aProtocol, aURIString, aBrowserOrWindow);
-
-    messageManager.sendAsyncMessage("WCCR:registerProtocolHandler",
-                                    { protocol: aProtocol,
-                                      uri: uri.spec,
-                                      title: aTitle });
-  },
-
-  /**
-   * See nsIFactory
-   */
-  createInstance(outer, iid) {
-    if (outer != null)
-      throw Cr.NS_ERROR_NO_AGGREGATION;
-    return this.QueryInterface(iid);
-  },
-
-  classID: WCCR_CLASSID,
-
-  /**
-   * See nsISupports
-   */
-  QueryInterface: XPCOMUtils.generateQI(
-                     [Ci.nsIWebContentHandlerRegistrar,
-                      Ci.nsIWebContentConverterService,
-                      Ci.nsIFactory])
-};
-
-this.NSGetFactory =
-  (Services.appinfo.processType === Services.appinfo.PROCESS_TYPE_CONTENT) ?
-    XPCOMUtils.generateNSGetFactory([WebContentConverterRegistrarContent]) :
-    XPCOMUtils.generateNSGetFactory([WebContentConverterRegistrar]);
diff --git a/browser/components/feeds/content/subscribe.js b/browser/components/feeds/content/subscribe.js
deleted file mode 100644
index 05a564bf1..000000000
--- a/browser/components/feeds/content/subscribe.js
+++ /dev/null
@@ -1,25 +0,0 @@
-/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-/* global BrowserFeedWriter */
-
-var SubscribeHandler = {
-  /**
-   * The nsIFeedWriter object that produces the UI
-   */
-  _feedWriter: null,
-
-  init: function SH_init() {
-    this._feedWriter = new BrowserFeedWriter();
-  },
-
-  writeContent: function SH_writeContent() {
-    this._feedWriter.writeContent();
-  },
-
-  uninit: function SH_uninit() {
-    this._feedWriter.close();
-  }
-};
diff --git a/browser/components/feeds/content/subscribe.xhtml b/browser/components/feeds/content/subscribe.xhtml
deleted file mode 100644
index a55c80053..000000000
--- a/browser/components/feeds/content/subscribe.xhtml
+++ /dev/null
@@ -1,74 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-
-<!DOCTYPE html [
-  <!ENTITY % htmlDTD
-    PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
-    "DTD/xhtml1-strict.dtd">
-  %htmlDTD;
-  <!ENTITY % globalDTD
-    SYSTEM "chrome://global/locale/global.dtd">
-  %globalDTD;
-  <!ENTITY % feedDTD
-    SYSTEM "chrome://browser/locale/feeds/subscribe.dtd">
-  %feedDTD;
-]>
-
-<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
-
-<html id="feedHandler"
-      xmlns="http://www.w3.org/1999/xhtml">
-  <head>
-    <title>&feedPage.title;</title>
-    <link rel="stylesheet"
-          href="chrome://browser/skin/feeds/subscribe.css"
-          type="text/css"
-          media="all"/>
-    <script type="application/javascript"
-            src="chrome://browser/content/feeds/subscribe.js"/>
-  </head>
-  <body onload="SubscribeHandler.writeContent();" onunload="SubscribeHandler.uninit();">
-    <div id="feedHeaderContainer">
-      <div id="feedHeader" dir="&locale.dir;">
-        <div id="feedIntroText">
-          <p id="feedSubscriptionInfo1" />
-          <p id="feedSubscriptionInfo2" />
-        </div>
-        <div id="feedSubscribeLine">
-          <label id="subscribeUsingDescription">
-            <select id="handlersMenuList">
-              <option id="liveBookmarksMenuItem" selected="true">&feedLiveBookmarks;</option>
-              <option disabled="true">&#x2501;&#x2501;&#x2501;&#x2501;&#x2501;&#x2501;&#x2501;</option>
-            </select>
-          </label>
-          <label id="checkboxText">
-            <input type="checkbox" id="alwaysUse" class="alwaysUse" checked="false"/>
-          </label>
-          <button id="subscribeButton">&feedSubscribeNow;</button>
-        </div>
-      </div>
-      <div id="feedHeaderContainerSpacer"/>
-    </div>
-
-    <script type="application/javascript">
-      /* import-globals-from subscribe.js */
-      SubscribeHandler.init();
-    </script>
-
-    <div id="feedBody">
-      <div id="feedTitle">
-        <a id="feedTitleLink">
-          <img id="feedTitleImage"/>
-        </a>
-        <div id="feedTitleContainer">
-          <h1 id="feedTitleText"/>
-          <h2 id="feedSubtitleText"/>
-        </div>
-      </div>
-      <div id="feedContent"/>
-    </div>
-  </body>
-</html>
diff --git a/browser/components/feeds/jar.mn b/browser/components/feeds/jar.mn
deleted file mode 100644
index 8570112c1..000000000
--- a/browser/components/feeds/jar.mn
+++ /dev/null
@@ -1,7 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-browser.jar:
-    content/browser/feeds/subscribe.xhtml               (content/subscribe.xhtml) 
-    content/browser/feeds/subscribe.js                  (content/subscribe.js)
diff --git a/browser/components/feeds/moz.build b/browser/components/feeds/moz.build
deleted file mode 100644
index b8755fcc9..000000000
--- a/browser/components/feeds/moz.build
+++ /dev/null
@@ -1,34 +0,0 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-JAR_MANIFESTS += ['jar.mn']
-
-XPIDL_SOURCES += [
-    'nsIFeedResultService.idl',
-    'nsIWebContentConverterRegistrar.idl',
-]
-
-XPIDL_MODULE = 'browser-feeds'
-
-SOURCES += [
-    'nsFeedSniffer.cpp',
-]
-
-EXTRA_COMPONENTS += [
-    'BrowserFeeds.manifest',
-    'FeedConverter.js',
-    'FeedWriter.js',
-    'WebContentConverter.js',
-]
-
-FINAL_LIBRARY = 'browsercomps'
-
-for var in ('MOZ_APP_NAME', 'MOZ_MACBUNDLE_NAME'):
-    DEFINES[var] = CONFIG[var]
-
-LOCAL_INCLUDES += [
-    '../build',
-]
diff --git a/browser/components/feeds/nsFeedSniffer.cpp b/browser/components/feeds/nsFeedSniffer.cpp
deleted file mode 100644
index f314d3d3b..000000000
--- a/browser/components/feeds/nsFeedSniffer.cpp
+++ /dev/null
@@ -1,363 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "nsFeedSniffer.h"
-
-
-#include "nsNetCID.h"
-#include "nsXPCOM.h"
-#include "nsCOMPtr.h"
-#include "nsStringStream.h"
-
-#include "nsBrowserCompsCID.h"
-
-#include "nsICategoryManager.h"
-#include "nsIServiceManager.h"
-#include "nsComponentManagerUtils.h"
-#include "nsServiceManagerUtils.h"
-
-#include "nsIStreamConverterService.h"
-#include "nsIStreamConverter.h"
-
-#include "nsIStreamListener.h"
-
-#include "nsIHttpChannel.h"
-#include "nsIMIMEHeaderParam.h"
-
-#include "nsMimeTypes.h"
-#include "nsIURI.h"
-#include <algorithm>
-
-#define TYPE_ATOM "application/atom+xml"
-#define TYPE_RSS "application/rss+xml"
-#define TYPE_MAYBE_FEED "application/vnd.mozilla.maybe.feed"
-
-#define NS_RDF "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-#define NS_RSS "http://purl.org/rss/1.0/"
-
-#define MAX_BYTES 512u
-
-NS_IMPL_ISUPPORTS(nsFeedSniffer,
-                  nsIContentSniffer,
-                  nsIStreamListener,
-                  nsIRequestObserver)
-
-nsresult
-nsFeedSniffer::ConvertEncodedData(nsIRequest* request,
-                                  const uint8_t* data,
-                                  uint32_t length)
-{
-  nsresult rv = NS_OK;
-
- mDecodedData = "";
- nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(request));
-  if (!httpChannel)
-    return NS_ERROR_NO_INTERFACE;
-
-  nsAutoCString contentEncoding;
-  httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("Content-Encoding"), 
-                                 contentEncoding);
-  if (!contentEncoding.IsEmpty()) {
-    nsCOMPtr<nsIStreamConverterService> converterService(do_GetService(NS_STREAMCONVERTERSERVICE_CONTRACTID));
-    if (converterService) {
-      ToLowerCase(contentEncoding);
-
-      nsCOMPtr<nsIStreamListener> converter;
-      rv = converterService->AsyncConvertData(contentEncoding.get(), 
-                                              "uncompressed", this, nullptr, 
-                                              getter_AddRefs(converter));
-      NS_ENSURE_SUCCESS(rv, rv);
-
-      converter->OnStartRequest(request, nullptr);
-
-      nsCOMPtr<nsIStringInputStream> rawStream =
-        do_CreateInstance(NS_STRINGINPUTSTREAM_CONTRACTID);
-      if (!rawStream)
-        return NS_ERROR_FAILURE;
-
-      rv = rawStream->SetData((const char*)data, length);
-      NS_ENSURE_SUCCESS(rv, rv);
-
-      rv = converter->OnDataAvailable(request, nullptr, rawStream, 0, length);
-      NS_ENSURE_SUCCESS(rv, rv);
-
-      converter->OnStopRequest(request, nullptr, NS_OK);
-    }
-  }
-  return rv;
-}
-
-template<int N>
-static bool
-StringBeginsWithLowercaseLiteral(nsAString& aString,
-                                 const char (&aSubstring)[N])
-{
-  return StringHead(aString, N).LowerCaseEqualsLiteral(aSubstring);
-}
-
-bool
-HasAttachmentDisposition(nsIHttpChannel* httpChannel)
-{
-  if (!httpChannel)
-    return false;
-
-  uint32_t disp;
-  nsresult rv = httpChannel->GetContentDisposition(&disp);
-
-  if (NS_SUCCEEDED(rv) && disp == nsIChannel::DISPOSITION_ATTACHMENT)
-    return true;
-
-  return false;
-}
-
-/**
- * @return the first occurrence of a character within a string buffer,
- *         or nullptr if not found
- */
-static const char*
-FindChar(char c, const char *begin, const char *end)
-{
-  for (; begin < end; ++begin) {
-    if (*begin == c)
-      return begin;
-  }
-  return nullptr;
-}
-
-/**
- *
- * Determine if a substring is the "documentElement" in the document.
- *
- * All of our sniffed substrings: <rss, <feed, <rdf:RDF must be the "document"
- * element within the XML DOM, i.e. the root container element. Otherwise,
- * it's possible that someone embedded one of these tags inside a document of
- * another type, e.g. a HTML document, and we don't want to show the preview
- * page if the document isn't actually a feed.
- *
- * @param   start
- *          The beginning of the data being sniffed
- * @param   end
- *          The end of the data being sniffed, right before the substring that
- *          was found.
- * @returns true if the found substring is the documentElement, false 
- *          otherwise.
- */
-static bool
-IsDocumentElement(const char *start, const char* end)
-{
-  // For every tag in the buffer, check to see if it's a PI, Doctype or 
-  // comment, our desired substring or something invalid.
-  while ( (start = FindChar('<', start, end)) ) {
-    ++start;
-    if (start >= end)
-      return false;
-
-    // Check to see if the character following the '<' is either '?' or '!'
-    // (processing instruction or doctype or comment)... these are valid nodes
-    // to have in the prologue. 
-    if (*start != '?' && *start != '!')
-      return false;
-    
-    // Now advance the iterator until the '>' (We do this because we don't want
-    // to sniff indicator substrings that are embedded within other nodes, e.g.
-    // comments: <!-- <rdf:RDF .. > -->
-    start = FindChar('>', start, end);
-    if (!start)
-      return false;
-
-    ++start;
-  }
-  return true;
-}
-
-/**
- * Determines whether or not a string exists as the root element in an XML data
- * string buffer.
- * @param   dataString
- *          The data being sniffed
- * @param   substring
- *          The substring being tested for existence and root-ness.
- * @returns true if the substring exists and is the documentElement, false
- *          otherwise.
- */
-static bool
-ContainsTopLevelSubstring(nsACString& dataString, const char *substring) 
-{
-  int32_t offset = dataString.Find(substring);
-  if (offset == -1)
-    return false;
-
-  const char *begin = dataString.BeginReading();
-
-  // Only do the validation when we find the substring.
-  return IsDocumentElement(begin, begin + offset);
-}
-
-NS_IMETHODIMP
-nsFeedSniffer::GetMIMETypeFromContent(nsIRequest* request, 
-                                      const uint8_t* data, 
-                                      uint32_t length, 
-                                      nsACString& sniffedType)
-{
-  nsCOMPtr<nsIHttpChannel> channel(do_QueryInterface(request));
-  if (!channel)
-    return NS_ERROR_NO_INTERFACE;
-
-  // Check that this is a GET request, since you can't subscribe to a POST...
-  nsAutoCString method;
-  channel->GetRequestMethod(method);
-  if (!method.EqualsLiteral("GET")) {
-    sniffedType.Truncate();
-    return NS_OK;
-  }
-
-  // We need to find out if this is a load of a view-source document. In this
-  // case we do not want to override the content type, since the source display
-  // does not need to be converted from feed format to XUL. More importantly, 
-  // we don't want to change the content type from something 
-  // nsContentDLF::CreateInstance knows about (e.g. application/xml, text/html 
-  // etc) to something that only the application fe knows about (maybe.feed) 
-  // thus deactivating syntax highlighting.
-  nsCOMPtr<nsIURI> originalURI;
-  channel->GetOriginalURI(getter_AddRefs(originalURI));
-
-  nsAutoCString scheme;
-  originalURI->GetScheme(scheme);
-  if (scheme.EqualsLiteral("view-source")) {
-    sniffedType.Truncate();
-    return NS_OK;
-  }
-
-  // Check the Content-Type to see if it is set correctly. If it is set to 
-  // something specific that we think is a reliable indication of a feed, don't
-  // bother sniffing since we assume the site maintainer knows what they're 
-  // doing. 
-  nsAutoCString contentType;
-  channel->GetContentType(contentType);
-  bool noSniff = contentType.EqualsLiteral(TYPE_RSS) ||
-                   contentType.EqualsLiteral(TYPE_ATOM);
-
-  // Check to see if this was a feed request from the location bar or from
-  // the feed: protocol. This is also a reliable indication.
-  // The value of the header doesn't matter.  
-  if (!noSniff) {
-    nsAutoCString sniffHeader;
-    nsresult foundHeader =
-      channel->GetRequestHeader(NS_LITERAL_CSTRING("X-Moz-Is-Feed"),
-                                sniffHeader);
-    noSniff = NS_SUCCEEDED(foundHeader);
-  }
-
-  if (noSniff) {
-    // check for an attachment after we have a likely feed.
-    if(HasAttachmentDisposition(channel)) {
-      sniffedType.Truncate();
-      return NS_OK;
-    }
-
-    // set the feed header as a response header, since we have good metadata
-    // telling us that the feed is supposed to be RSS or Atom
-    channel->SetResponseHeader(NS_LITERAL_CSTRING("X-Moz-Is-Feed"),
-                               NS_LITERAL_CSTRING("1"), false);
-    sniffedType.AssignLiteral(TYPE_MAYBE_FEED);
-    return NS_OK;
-  }
-
-  // Don't sniff arbitrary types.  Limit sniffing to situations that
-  // we think can reasonably arise.
-  if (!contentType.EqualsLiteral(TEXT_HTML) &&
-      !contentType.EqualsLiteral(APPLICATION_OCTET_STREAM) &&
-      // Same criterion as XMLHttpRequest.  Should we be checking for "+xml"
-      // and check for text/xml and application/xml by hand instead?
-      contentType.Find("xml") == -1) {
-    sniffedType.Truncate();
-    return NS_OK;
-  }
-
-  // Now we need to potentially decompress data served with 
-  // Content-Encoding: gzip
-  nsresult rv = ConvertEncodedData(request, data, length);
-  if (NS_FAILED(rv))
-    return rv;
-
-  // We cap the number of bytes to scan at MAX_BYTES to prevent picking up 
-  // false positives by accidentally reading document content, e.g. a "how to
-  // make a feed" page.
-  const char* testData;
-  if (mDecodedData.IsEmpty()) {
-    testData = (const char*)data;
-    length = std::min(length, MAX_BYTES);
-  } else {
-    testData = mDecodedData.get();
-    length = std::min(mDecodedData.Length(), MAX_BYTES);
-  }
-
-  // The strategy here is based on that described in:
-  // http://blogs.msdn.com/rssteam/articles/PublishersGuide.aspx
-  // for interoperarbility purposes.
-
-  // Thus begins the actual sniffing.
-  nsDependentCSubstring dataString((const char*)testData, length);
-
-  bool isFeed = false;
-
-  // RSS 0.91/0.92/2.0
-  isFeed = ContainsTopLevelSubstring(dataString, "<rss");
-
-  // Atom 1.0
-  if (!isFeed)
-    isFeed = ContainsTopLevelSubstring(dataString, "<feed");
-
-  // RSS 1.0
-  if (!isFeed) {
-    isFeed = ContainsTopLevelSubstring(dataString, "<rdf:RDF") &&
-      dataString.Find(NS_RDF) != -1 &&
-      dataString.Find(NS_RSS) != -1;
-  }
-
-  // If we sniffed a feed, coerce our internal type
-  if (isFeed && !HasAttachmentDisposition(channel))
-    sniffedType.AssignLiteral(TYPE_MAYBE_FEED);
-  else
-    sniffedType.Truncate();
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsFeedSniffer::OnStartRequest(nsIRequest* request, nsISupports* context)
-{
-  return NS_OK;
-}
-
-nsresult
-nsFeedSniffer::AppendSegmentToString(nsIInputStream* inputStream,
-                                     void* closure,
-                                     const char* rawSegment,
-                                     uint32_t toOffset,
-                                     uint32_t count,
-                                     uint32_t* writeCount)
-{
-  nsCString* decodedData = static_cast<nsCString*>(closure);
-  decodedData->Append(rawSegment, count);
-  *writeCount = count;
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsFeedSniffer::OnDataAvailable(nsIRequest* request, nsISupports* context,
-                               nsIInputStream* stream, uint64_t offset, 
-                               uint32_t count)
-{
-  uint32_t read;
-  return stream->ReadSegments(AppendSegmentToString, &mDecodedData, count, 
-                              &read);
-}
-
-NS_IMETHODIMP
-nsFeedSniffer::OnStopRequest(nsIRequest* request, nsISupports* context, 
-                             nsresult status)
-{
-  return NS_OK; 
-}
diff --git a/browser/components/feeds/nsFeedSniffer.h b/browser/components/feeds/nsFeedSniffer.h
deleted file mode 100644
index a0eb9862c..000000000
--- a/browser/components/feeds/nsFeedSniffer.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-
-#include "nsIContentSniffer.h"
-#include "nsIStreamListener.h"
-#include "nsStringAPI.h"
-#include "mozilla/Attributes.h"
-
-class nsFeedSniffer final : public nsIContentSniffer,
-                                   nsIStreamListener
-{
-public:
-  NS_DECL_ISUPPORTS
-  NS_DECL_NSICONTENTSNIFFER
-  NS_DECL_NSIREQUESTOBSERVER
-  NS_DECL_NSISTREAMLISTENER
-
-  static nsresult AppendSegmentToString(nsIInputStream* inputStream,
-                                        void* closure,
-                                        const char* rawSegment,
-                                        uint32_t toOffset,
-                                        uint32_t count,
-                                        uint32_t* writeCount);
-
-protected:
-  ~nsFeedSniffer() {}
-
-  nsresult ConvertEncodedData(nsIRequest* request, const uint8_t* data,
-                              uint32_t length);
-
-private:
-  nsCString mDecodedData;
-};
-
diff --git a/browser/components/feeds/nsIFeedResultService.idl b/browser/components/feeds/nsIFeedResultService.idl
deleted file mode 100644
index f745fa693..000000000
--- a/browser/components/feeds/nsIFeedResultService.idl
+++ /dev/null
@@ -1,70 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "nsISupports.idl"
-interface nsIURI;
-interface nsIRequest;
-interface nsIFeedResult;
-
-/**
- * nsIFeedResultService provides a globally-accessible object for retrieving
- * the results of feed processing.
- */
-[scriptable, uuid(95309fd2-7b3a-47fb-97f3-5c460d9473cd)]
-interface nsIFeedResultService : nsISupports
-{
-  /**
-   * When set to true, forces the preview page to be displayed, regardless
-   * of the user's preferences.
-   */
-  attribute boolean forcePreviewPage;
-
-  /**
-   * Adds a URI to the user's specified external feed handler, or live
-   * bookmarks.
-   * @param   uri
-   *          The uri of the feed to add.
-   * @param   title
-   *          The title of the feed to add.
-   * @param   subtitle
-   *          The subtitle of the feed to add.
-   * @param   feedType
-   *          The nsIFeed type of the feed.  See nsIFeed.idl
-   * @param   feedReader
-   *          The type of feed reader we're using (client, bookmarks, default)
-   *          If this parameter is null, the type is set to default
-   */
-  void addToClientReader(in AUTF8String uri,
-                         in AString title,
-                         in AString subtitle,
-                         in unsigned long feedType,
-                         [optional] in AString feedReader);
-
-  /**
-   * Registers a Feed Result object with a globally accessible service
-   * so that it can be accessed by a singleton method outside the usual
-   * flow of control in document loading.
-   *
-   * @param   feedResult
-   *          An object implementing nsIFeedResult representing the feed.
-   */
-  void addFeedResult(in nsIFeedResult feedResult);
-
-  /**
-   * Gets a Feed Handler object registered using addFeedResult.
-   *
-   * @param   uri
-   *          The URI of the feed a handler is being requested for
-   */
-  nsIFeedResult getFeedResult(in nsIURI uri);
-
-  /**
-   * Unregisters a Feed Handler object registered using addFeedResult.
-   * @param   uri
-   *          The feed URI the handler was registered under. This must be
-   *          the same *instance* the feed was registered under.
-   */
-  void removeFeedResult(in nsIURI uri);
-};
diff --git a/browser/components/feeds/nsIWebContentConverterRegistrar.idl b/browser/components/feeds/nsIWebContentConverterRegistrar.idl
deleted file mode 100644
index 08ce2f4ae..000000000
--- a/browser/components/feeds/nsIWebContentConverterRegistrar.idl
+++ /dev/null
@@ -1,117 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "nsIMIMEInfo.idl"
-#include "nsIWebContentHandlerRegistrar.idl"
-
-interface nsIRequest;
-
-[scriptable, uuid(eb361098-5158-4b21-8f98-50b445f1f0b2)]
-interface nsIWebContentHandlerInfo : nsIHandlerApp
-{
-  /**
-   * The content type handled by the handler
-   */
-  readonly attribute AString contentType;
-
-  /**
-   * The uri of the handler, with an embedded %s where the URI of the loaded
-   * document will be encoded.
-   */
-  readonly attribute AString uri;
-
-  /** 
-   * Gets the service URL Spec, with the loading document URI encoded in it.
-   * @param   uri
-   *          The URI of the document being loaded
-   * @returns The URI of the service with the loading document URI encoded in 
-   *          it.
-   */
-  AString getHandlerURI(in AString uri);
-};
-
-[scriptable, uuid(de7cc06e-e778-45cb-b7db-7a114e1e75b1)]
-interface nsIWebContentConverterService : nsIWebContentHandlerRegistrar
-{
-  /**
-   * Specifies the handler to be used to automatically handle all links of a
-   * certain content type from now on. 
-   * @param   contentType
-   *          The content type to automatically load with the specified handler
-   * @param   handler
-   *          A web service handler. If this is null, no automatic action is
-   *          performed and the user must choose.
-   * @throws  NS_ERROR_NOT_AVAILABLE if the service refered to by |handler| is 
-   *          not already registered.
-   */
-  void setAutoHandler(in AString contentType, in nsIWebContentHandlerInfo handler);
-
-  /**
-   * Gets the auto handler specified for a particular content type
-   * @param   contentType
-   *          The content type to look up an auto handler for.
-   * @returns The web service handler that will automatically handle all 
-   *          documents of the specified type. null if there is no automatic
-   *          handler. (Handlers may be registered, just none of them specified
-   *          as "automatic").
-   */
-  nsIWebContentHandlerInfo getAutoHandler(in AString contentType);
-
-  /**
-   * Gets a web handler for the specified service URI
-   * @param   contentType
-   *          The content type of the service being located
-   * @param   uri
-   *          The service URI of the handler to locate.
-   * @returns A web service handler that uses the specified uri.
-   */
-  nsIWebContentHandlerInfo getWebContentHandlerByURI(in AString contentType, 
-                                                     in AString uri);
-
-  /**
-   * Loads the preferred handler when content of a registered type is about
-   * to be loaded.
-   * @param   request
-   *          The nsIRequest for the load of the content
-   */
-  void loadPreferredHandler(in nsIRequest request);
-
-  /**
-   * Removes a registered protocol handler
-   * @param   protocol
-   *          The protocol scheme to remove a service handler for
-   * @param   uri
-   *          The uri of the service handler to remove
-   */
-  void removeProtocolHandler(in AString protocol, in AString uri);
-
-  /**
-   * Removes a registered content handler
-   * @param   contentType
-   *          The content type to remove a service handler for
-   * @param   uri
-   *          The uri of the service handler to remove
-   */
-  void removeContentHandler(in AString contentType, in AString uri);
-
-  /**
-   * Gets the list of content handlers for a particular type.
-   * @param   contentType
-   *          The content type to get handlers for
-   * @returns An array of nsIWebContentHandlerInfo objects
-   */
-  void getContentHandlers(in AString contentType,
-                          [optional] out unsigned long count,
-                          [retval,array,size_is(count)] out nsIWebContentHandlerInfo handlers);
-
-  /**
-   * Resets the list of available content handlers to the default set from
-   * the distribution.
-   * @param   contentType
-   *          The content type to reset handlers for
-   */
-  void resetHandlersForType(in AString contentType);
-};
-